Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette Sponsored by
VBP

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 05-12-2008, 09:14 AM   #1
Mikeg72
CF Member
 
Mikeg72's Avatar
 
Member Since: Oct 2006
Default Battery cable nearly burned my car up - Help

Well, 1st. outing for the year was like heaven (as usual) loving life.
After about 1/2 hour of driving, close to home the car violently bucked and suddenly quit. Pulled it off the side of the road and I noticed smoke pouring out of the battery compartment. I grabbed my fire extinguisher and opened the battery compartment lid to find the negative battery wire glowing red hot and the insulation on fire! Put it out
quickly with a shot of extinguisher and cut the battery cable.

Phew! Awful glad I always carry a fire extinguisher in the car! No damage at all after I hosed off the battery & battery compartment other than a fried battery cable.

Any ideas where to look? Also, would it be a good idea to add a fuse or fusible link
Inline (just in case)? What amperage fuse would I use?

Thanks!

Mike
Mikeg72 is offline   Reply With Quote
Old 05-12-2008, 09:40 AM   #2
SIXFOOTER
CF Senior Member
Support Corvetteforum!
 
SIXFOOTER's Avatar
 
Member Since: Jan 2006
Location: Boca Raton Florida
Default

your going to need to have that battery tested and get the alternator tested also. Replace the cable and nake sure to get or make one that is the same size or even better 1 size larger.
The battery either tiik s sheite and was drawing to much current thru a bad battery connection, or the alternator went wild and was putting out to much current and that found the same bad battery connection. There is only 1 reason for the cable to light up like that and its to much current. That can be either because the alternator is producing to much, or a bad connection on the cable.
What year is your car? The way mine is wired there is a fuse link from the alternator to the battery, its an 81. That would have burned open no problem if the root cause had been the alternator, or the battery.
If the battery shorts internally, it could to the same thing, it will draw a Huge amount of current off the alternator.
SIXFOOTER is offline   Reply With Quote
Old 05-12-2008, 10:02 AM   #3
mrvette
CF Senior Member
 
mrvette's Avatar
 
Member Since: Jul 1999
Location: Orange Park Florida
Default

THE ONLY thing that will fry a cable like that is a direct short from positive cable to ground.....the two ends of that cable are one on the battery of course, the other on the starter solenoid with a much thinner fuse link or maybe even a FUSE leading to the main harness....

you issue is that somehow that + wire is shorted to ground...either pinched in the tranny tunnel, or the starter is fried but good....either way, if the + wire is thicker than the negative wire going to ground at the chassis under the batt box....the thinner wire will fry.... the engine is grounded to the chassis by a ~6" piece of battery cable under the pass side engine mount.....

I think there is no way any alternator condition will fry any battery cable without first frying all the thinner harness wires under the hood...

I think the old battery cable maybe resting on a header?? something loose letting it droop that far, and it welded itself but good....damn wires tend to do that....arc and stick while the damn world goes to hell around it....

__________________
GENE

"Liberalism is a disease of the terminally stupid."


All products should say "Do not use if your stupid"




http://s1005.photobucket.com/albums/af176/mrvette72/

http://mrvette.shutterfly.com/vette2011
mrvette is offline   Reply With Quote
Old 05-12-2008, 10:04 AM   #4
Bullshark
CF Senior Member
CI 5 & 8 Veteran
 
Bullshark's Avatar
 
Member Since: Nov 2003
Location: St. Charles Mo
Default

Danny, I'm not following your logic?? If the battery developed an internal short, and tried to pull large current from the alt., wouldn't the smaller gauge wire from the alt to the starter go up in smoke first?....not to mention the fusible links. That would also be true if the alt developed a short. Assuming the engine wire harness is ok ( aka the one with the alt charging wire), I am betting the large positive battery cable that connects down around the starter developed a short to ground. Either via the starter or shorted cable. What am I missing?

Bullshark

P.S.
Ok, Gene, sounds like you are on the same thought track
Bullshark is offline   Reply With Quote
Old 05-12-2008, 04:27 PM   #5
SIXFOOTER
CF Senior Member
Support Corvetteforum!
 
SIXFOOTER's Avatar
 
Member Since: Jan 2006
Location: Boca Raton Florida
Default

Quote:
Originally Posted by Bullshark View Post
Danny, I'm not following your logic?? If the battery developed an internal short, and tried to pull large current from the alt., wouldn't the smaller gauge wire from the alt to the starter go up in smoke first?....not to mention the fusible links. That would also be true if the alt developed a short. Assuming the engine wire harness is ok ( aka the one with the alt charging wire), I am betting the large positive battery cable that connects down around the starter developed a short to ground. Either via the starter or shorted cable. What am I missing?

Bullshark

P.S.
Ok, Gene, sounds like you are on the same thought track
Your correct unless the battery cable that fried had a bad/marginal end on it. In that case the battery drawing its normal current may have been more than the marginal cable end could handle on a continous basis, it heated up and eventullt fried. The alternator wire might still be fine.
Didn't he say it was the Neg cable that burned?
I don't see anything in my battery box for the + cable to short to in order to get that kind of burn, maybe somewhere on the frame under the box? Starter also a good place to look for that. If it was the + cable that shorted and caused the Neg cable to burn it wouldn't necessarily affect the fuse links.
SIXFOOTER is offline   Reply With Quote
Old 05-12-2008, 05:39 PM   #6
Bullshark
CF Senior Member
CI 5 & 8 Veteran
 
Bullshark's Avatar
 
Member Since: Nov 2003
Location: St. Charles Mo
Default

Your correct, He did say neg cable. I didn't pick up on that. That does most likely point to a high resistance connection in the neg. cable. I have seen this happen with those aftermarket clamp on battery terminals when they corrode and loose their low resistance connection. The high connection resistance gets red hot and starts burning the insulation. I do find it hard to believe that the normally small load that the ignition/ day time accessories, would pull while running, would be enough current to make that large gage wire glow read hot. Smoke and hot at the connection, yes.....but glowing red hot wire????...that stinks of a short somewhere. That kind of load would surely fry the positive wire harness feed wires I would think. I am not that familiar with lead acid battery failure modes but I guess if the positive side of one of the cells shorted to ground, it could pull a lot of current through the neg. cable. He might be lucky the battery didn't blow first. Seems low probability though Again, it could also be a short in the positive cable somewhere between the starter and positive batt termisal.



Bullshark
Bullshark is offline   Reply With Quote
Old 05-12-2008, 08:39 PM   #7
7T1vette
CF Senior Member
 
7T1vette's Avatar
 
Member Since: Jan 2006
Location: Crossville TN
Default

If the short was internal to the battery, the cable connected to it would not be "glowing". An alternator can't put out the kind of current necessary to do what occured. IMO, there had to be a dead-short of the positive battery cable to chassis ground or a dead-short in the starter/solenoid for such a problem to happen.
7T1vette is offline   Reply With Quote
Old 05-12-2008, 08:45 PM   #8
kaiserbud
CF Senior Member
 
kaiserbud's Avatar
 
Member Since: Feb 2001
Default

kaiserbud is offline   Reply With Quote
Old 05-12-2008, 08:53 PM   #9
MotorHead
CF Senior Member
 
MotorHead's Avatar
 
Member Since: Apr 2000
Location: Never argue with Morons. If you do, you'll lower yourself to their standards, and they'll win, based on experience !!!
Default

Quote:
Originally Posted by 7T1vette View Post
If the short was internal to the battery, the cable connected to it would not be "glowing". An alternator can't put out the kind of current necessary to do what occured. IMO, there had to be a dead-short of the positive battery cable to chassis ground or a dead-short in the starter/solenoid for such a problem to happen.
I agree, a dead short somewhere, positive hot wire to the starter melting on a header or exhaust, just an example, but all battery energy is just going from the positive cable thru wherever the short is to the negative cable burning it up
__________________
1980 Corvette, 427ci Motown SBC 465RWHP N/A so far,500 is the goal, AFR 227 Eliminators
T&D Shaft Rockers,Vic Jr, XR286R solid roller,248/254 dur .640" lift 10.6:1 Mahle pistons
Eagle stroker rods, 4 in. Callies DragonSlayer crank, 825 Drag Race Demon, 3 in exhaust
Paint by Dream Car Garage......................................My'70 CUDALotsa ladies and lotsa trouble
MotorHead is offline   Reply With Quote
Old 05-12-2008, 09:59 PM   #10
CorvetteDave01
CF Senior Member
Support Corvetteforum!
 
CorvetteDave01's Avatar
 
Member Since: Mar 2005
Location: Salina Kansas
Default

It may be your fuseable link from the starter power wire have been removed like mine were. Accident waiting to happen.
CorvetteDave01 is offline   Reply With Quote
Old 05-13-2008, 03:50 AM   #11
RunningMan373
CF Senior Member
 
RunningMan373's Avatar
 
Member Since: May 2007
Location: Bay Area CA
Default

Quote:
Originally Posted by mrvette View Post
THE ONLY thing that will fry a cable like that is a direct short from positive cable to ground.....the two ends of that cable are one on the battery of course, the other on the starter solenoid with a much thinner fuse link or maybe even a FUSE leading to the main harness....

you issue is that somehow that + wire is shorted to ground...either pinched in the tranny tunnel, or the starter is fried but good....either way, if the + wire is thicker than the negative wire going to ground at the chassis under the batt box....the thinner wire will fry.... the engine is grounded to the chassis by a ~6" piece of battery cable under the pass side engine mount.....

I think there is no way any alternator condition will fry any battery cable without first frying all the thinner harness wires under the hood...

I think the old battery cable maybe resting on a header?? something loose letting it droop that far, and it welded itself but good....damn wires tend to do that....arc and stick while the damn world goes to hell around it....




Look for a short on the positive batt cable from the batt to the starter.
RunningMan373 is offline   Reply With Quote
Old 05-13-2008, 06:14 AM   #12
Mikeg72
CF Member
 
Mikeg72's Avatar
 
Member Since: Oct 2006
Default

I had the alternator checked out and it passed so I would think it's not
a factor. Checking the remaining wiring, I spent hours looking over every inch but I found absolutely nothing out of the ordinary. The dammage was limited to the wire off the battery which goes to a frame bolt. From there, it's fine. One thing, that wire off the battery is 4 AWG and the wire going from the frame bolt at the rear of the car to the front is a 1 AWG. I don't know alot about wire but I understood that you shouldn't mix wire sizes. This happened after driving for 30 minutes but could the wire size have anything to do with it?

Thanks for all your input!!

Mike
Mikeg72 is offline   Reply With Quote
Old 05-13-2008, 06:31 AM   #13
RunningMan373
CF Senior Member
 
RunningMan373's Avatar
 
Member Since: May 2007
Location: Bay Area CA
Default

They do get resistive and corroded. The one I pulled off of mine was pretty well shot. Recommend getting two ground cables, the - batt to frame one and the one between the engine and frame. You can order exact replacements but in the mean time, if you want to drive now, you can go down to local parts store and get some appropriate length batt ground cables, in the plastic packages, with a flat with a hole on both ends for the engine to frame and one with a top or side post and a flat with a hole in it, for the - batt cable.

Also do this, get a tube of 3M electrical grease and some med grit sand paper, when you remove the old cables, sand the hook up points till you see silver metal, wipe it off with a clean, dry rag, then put electrical grease on the spot. Then torque down the cables pretty well, using the lock washers. that'll give you a good connection for your main grounds, makes all the difference. I'm betting it was a resistive neg gnd cable due to corrosion.

Also the 4 gauge should be ok for driving, it wasn't the gauge that caused this.
RunningMan373 is offline   Reply With Quote
Old 05-13-2008, 07:40 AM   #14
Mikeg72
CF Member
 
Mikeg72's Avatar
 
Member Since: Oct 2006
Default

I will also take the strarter motor out and take a good look at the positive wire. Since it's so tight between the manifold & block, I can't
really get a good look at what's going on visually.

I'll keep ya posted.

Thanks!

Mike
Mikeg72 is offline   Reply With Quote
Old 05-13-2008, 11:13 AM   #15
7T1vette
CF Senior Member
 
7T1vette's Avatar
 
Member Since: Jan 2006
Location: Crossville TN
Default

You should also replace the starter solenoid. Disassemble the old one to see if there is evidence of internal shorting. You really need to find the cause of this problem, or you could experience the same thing later. Having too small a wire in there would cause excess current draw...but only for the time the engine took to start. You need to locate a source of constant current draw...a dead-short somewhere. I would be concerned with burning the car up [or worse] if you can't find the source.
7T1vette is offline   Reply With Quote
Old 05-13-2008, 11:46 AM   #16
Mikeg72
CF Member
 
Mikeg72's Avatar
 
Member Since: Oct 2006
Default

Quote:
Originally Posted by 7T1vette View Post
You should also replace the starter solenoid. Disassemble the old one to see if there is evidence of internal shorting. You really need to find the cause of this problem, or you could experience the same thing later. Having too small a wire in there would cause excess current draw...but only for the time the engine took to start. You need to locate a source of constant current draw...a dead-short somewhere. I would be concerned with burning the car up [or worse] if you can't find the source.
Will do..
Mikeg72 is offline   Reply With Quote
Old 05-13-2008, 08:48 PM   #17
Mikeg72
CF Member
 
Mikeg72's Avatar
 
Member Since: Oct 2006
Default Found it!

I installed new battery cables and ran a continuity check and it showed a dead short. I traced the positive battery cable to the starter motor and removed the motor. I found The heat shield had worn a hole through the positive cable insulation and it shorted there. I'm very fortunate to have had the fire extinguisher on board when it happened. I would have been standing on the side of the road watching my car burn up. That $15.00 fire extinguisher saved my baby...

Can't thank you guys & gals enough for all your help, it ultimately sent me in the right direction to resolving this mystery.

Thanks again!

Mike
Mikeg72 is offline   Reply With Quote
Old 05-13-2008, 09:14 PM   #18
MotorHead
CF Senior Member
 
MotorHead's Avatar
 
Member Since: Apr 2000
Location: Never argue with Morons. If you do, you'll lower yourself to their standards, and they'll win, based on experience !!!
Default

Quote:
Originally Posted by MotorHead View Post
I agree, a dead short somewhere, positive hot wire to the starter melting on a header or exhaust, just an example, but all battery energy is just going from the positive cable thru wherever the short is to the negative cable burning it up

Another one for the fridge
MotorHead is offline   Reply With Quote
Old 05-13-2008, 10:02 PM   #19
kdf1986
CF Senior Member
 
kdf1986's Avatar
 
Member Since: Jun 2004
Location: Campbell ca
Default

Good job on finding out the source of the problem, and thanks for posting what this turned out to be. I may be adding new battery cables to my list of things to do this summer.

kdf
kdf1986 is offline   Reply With Quote
Old 05-14-2008, 06:37 PM   #20
kaiserbud
CF Senior Member
 
kaiserbud's Avatar
 
Member Since: Feb 2001
Default

Good thread - makes you realize how the overlooked fire extinguisher is REALLY WORTHWHILE.
kaiserbud is offline   Reply With Quote
Old 05-14-2008, 06:37 PM
 
Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Reload this Page Battery cable nearly burned my car up - Help
 
 
 
Reply

Tags
bad, battery, bunrt, burned, burning, c3, cable, cables, corrosion, corvette, fusible, hot, internal, link, positive, wire


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
C6 PARTS & TECH NEWS 09-02-05 NEW INFORMATION CorvettePartsBob Ken's Newsletters 12 12-04-2005 12:59 PM


All times are GMT -4. The time now is 11:42 AM.


Emails & Password Backup

Search Engine Friendly URLs by vBSEO 3.5.2