Alternator
#1
Racer
Thread Starter
Alternator
Did a alternator test with a volt meter hooked to battery. Rpm about 2500. This is the reading I got. Do I need a new alternator? Car fires right up. Thanks for suggestions.
#2
Le Mans Master
I think 12.5 ok..
this is good chart i was given on this forum
if you need alternator and yours is original…KEEP it..and rebuild it.!!!
this is good chart i was given on this forum
if you need alternator and yours is original…KEEP it..and rebuild it.!!!
#3
Racer
Thread Starter
#4
Racer
Post a pic of the Part Number. The application is easy to find. http://corvettec3.ca/index.htm
I think I found the numbers for my ‘71 there. And , if you don’t want an original alt case, I’d like it.
Steve O.
I think I found the numbers for my ‘71 there. And , if you don’t want an original alt case, I’d like it.
Steve O.
#5
If that thing is reading 12.4 vdc (I cannot see it for ****) at 2500 rpm, then your Alternator is not adequate. Remove it and go get it tested.
The following 2 users liked this post by carriljc:
73racevette (10-27-2022),
Bikespace (10-16-2022)
#6
Racer
Thread Starter
#7
Le Mans Master
The chinesium replacements are crap..and draw more horsepower than oem..
if you are 12.4, you are on low barely out.
if driving, starting, and handling power draws ok..i would drive it…
keep an eye on it..drive around headlights on and park it and measure battery voltage..
pics of alternator? And numbers?
if you are 12.4, you are on low barely out.
if driving, starting, and handling power draws ok..i would drive it…
keep an eye on it..drive around headlights on and park it and measure battery voltage..
pics of alternator? And numbers?
#8
Racer
Thread Starter
The chinesium replacements are crap..and draw more horsepower than oem..
if you are 12.4, you are on low barely out.
if driving, starting, and handling power draws ok..i would drive it…
keep an eye on it..drive around headlights on and park it and measure battery voltage..
pics of alternator? And numbers?
if you are 12.4, you are on low barely out.
if driving, starting, and handling power draws ok..i would drive it…
keep an eye on it..drive around headlights on and park it and measure battery voltage..
pics of alternator? And numbers?
#9
Burning Brakes
That voltage is too low; it should be about 14.5V when charging. Review my recent thread:
https://www.corvetteforum.com/forums...ery-drain.html
Part number is towards the belt on the same side of altearnator casing where the 2 wire plug goes into it. see mine in attached pic.
Fran
https://www.corvetteforum.com/forums...ery-drain.html
Part number is towards the belt on the same side of altearnator casing where the 2 wire plug goes into it. see mine in attached pic.
Fran
The following users liked this post:
73racevette (10-27-2022)
#10
Le Mans Master
Take a look here for numbers..
it looks like a rebuild as it is clocked wrong..but try to see numbers anyway , unless blasted off..
it looks like a rebuild as it is clocked wrong..but try to see numbers anyway , unless blasted off..
#11
Racer
Thread Starter
That voltage is too low; it should be about 14.5V when charging. Review my recent thread:
https://www.corvetteforum.com/forums...ery-drain.html
Part number is towards the belt on the same side of altearnator casing where the 2 wire plug goes into it. see mine in attached pic.
Fran
https://www.corvetteforum.com/forums...ery-drain.html
Part number is towards the belt on the same side of altearnator casing where the 2 wire plug goes into it. see mine in attached pic.
Fran
#12
Le Mans Master
Maybe..
lets see what numbers say..if crap rebuild..someone can maybe recommend a non chinesium replacement..
I would make darn sure your battery cables are tight and your ground connections are tight and not corroded.
Looks like somebody’s got an extra ground(s) down there to going somewhere
lets see what numbers say..if crap rebuild..someone can maybe recommend a non chinesium replacement..
I would make darn sure your battery cables are tight and your ground connections are tight and not corroded.
Looks like somebody’s got an extra ground(s) down there to going somewhere
Last edited by interpon; 10-16-2022 at 07:17 PM.
#13
Burning Brakes
It could. As for a rebuilt kit. I got this one off of Ebay. A great product and it contains more parts than the NAPA kit I bought and for 1/2 the price. It has been working great.
https://www.ebay.com/itm/190606801960
Fran
https://www.ebay.com/itm/190606801960
Fran
The following users liked this post:
interpon (10-16-2022)
#14
Racer
Thread Starter
Maybe..
lets see what numbers say..if crap rebuild..someone can maybe recommend a non chinesium replacement..
I would make darn sure your battery cables are tight and your ground connections are tight and not corroded.
Looks like somebody’s got an extra ground(s) down there to going somewhere
lets see what numbers say..if crap rebuild..someone can maybe recommend a non chinesium replacement..
I would make darn sure your battery cables are tight and your ground connections are tight and not corroded.
Looks like somebody’s got an extra ground(s) down there to going somewhere
#15
Racer
Thread Starter
#16
Le Mans Master
If you cannot read numbers in the place they should be, it is probably a rebuild that has been blasted to oblivion, but just make sure in case original and someone rebuilt and clocked wrong.
Beng clocked wrong is about where it should be for wires, placement etc.. same alternator, 1000 applications…both halves can be split and repositioned.
What do those ground wires go to? Do you have electric fans?
this site / linkmay help
http://www.madelectrical.com/electri...elcoremy.shtml
Beng clocked wrong is about where it should be for wires, placement etc.. same alternator, 1000 applications…both halves can be split and repositioned.
What do those ground wires go to? Do you have electric fans?
this site / linkmay help
http://www.madelectrical.com/electri...elcoremy.shtml
#17
Racer
Thread Starter
If you cannot read numbers in the place they should be, it is probably a rebuild that has been blasted to oblivion, but just make sure in case original and someone rebuilt and clocked wrong.
Beng clocked wrong is about where it should be for wires, placement etc.. same alternator, 1000 applications…both halves can be split and repositioned.
What do those ground wires go to? Do you have electric fans?
this site / linkmay help
http://www.madelectrical.com/electri...elcoremy.shtml
Beng clocked wrong is about where it should be for wires, placement etc.. same alternator, 1000 applications…both halves can be split and repositioned.
What do those ground wires go to? Do you have electric fans?
this site / linkmay help
http://www.madelectrical.com/electri...elcoremy.shtml
#18
Safety Car
Member Since: Oct 2007
Location: Seattle Area Washington
Posts: 3,675
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I believe your clocking is correct for your application.
Your unloaded test results are low, should be around 14 vdc.
If the loaded test was done with both the HI Beam headlights and blower motor on HI that to looks low, should be in the mid 13vdc range
Last edited by bmotojoe; 10-16-2022 at 08:30 PM.
#19
Safety Car
Member Since: Oct 2007
Location: Seattle Area Washington
Posts: 3,675
Received 1,298 Likes
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1,017 Posts
I don't know what was recorded in the test you had done?
Here are test results for my 80 amp alternator and good battery using a different tester.
Here are test results for my 80 amp alternator and good battery using a different tester.