700r4 valve body wiring question
08-16-2007, 09:51 PM
#1
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700r4 valve body wiring question
hey guys, here is a pic of my valve body and wire harness, looks like i have two pressure switches and a plug, but the wiring harness only has provisions for "one" do i have the right harness? im guessing the wire goes to the switch with 2 connectors on it, i also need to wire in a vacuum switch also so i can lock up the converter because the computer is kaput, maybe i should plug the other switch? safer? or should i connect all three, i have no idea, so any help is appreciated!
my firebird sold the other day so now im in a mad rush to get this thing on the road at least to get to work and back, (not far, lol)
my firebird sold the other day so now im in a mad rush to get this thing on the road at least to get to work and back, (not far, lol)
Last edited by billybonesmusic; 08-16-2007 at 09:53 PM. Reason: pic
08-16-2007, 10:41 PM
#2
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one wire is the TCC (Torque Converter Clutch), the other is the 4th gear switch ( which goes to the ECM telling it the tranny is in 4th gear). The other wire is the speedometer pulse wire ( which goes to the console telling you how fast your going). I can e-mail you a circuit diagram if you so wish. These are the wires coming off the transmission. What you have looks like the TCC servo but i could be wrong.
Last edited by trackman44; 08-16-2007 at 10:44 PM.
08-17-2007, 04:38 AM
#3
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"The other wire is the speedometer pulse wire"
Speedo signal is from VSS in tailshaft housing ;not valve body.
The lockup solenoid has a hot feed grounded back at the ECM.(2 wires)
The 4th gear switch goes to ground at the valve body.
At the external plug (4 holes / 3 wires )
12V is ppl ,
TCC ground to ECM is tan /blk
4th gear switch is lt blu
Speedo signal is from VSS in tailshaft housing ;not valve body.
The lockup solenoid has a hot feed grounded back at the ECM.(2 wires)
The 4th gear switch goes to ground at the valve body.
At the external plug (4 holes / 3 wires )
12V is ppl ,
TCC ground to ECM is tan /blk
4th gear switch is lt blu
08-17-2007, 09:23 AM
#5
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WAIT A MINUTE! DUHHHHHHHHH, i just answered my own question, since the computer is gone....i have no need for the other pressure switches, i just need the one wire going to the switch with (2) prongs, and hook up a vaccum switch inline with it, and that will control my t/c lock-up function. i can even hook a toggle switch up to it for manual control, ok, im an idiot we did almost the same on my buddies Z28 700r4. sorry, 
08-17-2007, 09:36 AM
#6
My favorite way to wire these is for 4th gear only lock up. No computer or vacuum switches needed for this method.
To do 4th gear only, leave the 2 prong pulse swith alone, as it serves as a pipe plug.
Replace the single prong switch that you currently have(normally closed) with the normally open type. I have the gm part number handy and can look it up if you like.
Make sure terminal A has 12 volt ignition power and leave that wire alone. Cut the ground wire on the solenoid and run it directly to the 4the only (normally open) switch in the v/b. That is all there is to it.
There are many aftermarket lock up kits out there, and I do not like any of them. Toggle switch arrangements become a pain in the nuts very quickly. Vacuum arrangements suck as well.
To do 4th gear only, leave the 2 prong pulse swith alone, as it serves as a pipe plug.
Replace the single prong switch that you currently have(normally closed) with the normally open type. I have the gm part number handy and can look it up if you like.
Make sure terminal A has 12 volt ignition power and leave that wire alone. Cut the ground wire on the solenoid and run it directly to the 4the only (normally open) switch in the v/b. That is all there is to it.
There are many aftermarket lock up kits out there, and I do not like any of them. Toggle switch arrangements become a pain in the nuts very quickly. Vacuum arrangements suck as well.
08-17-2007, 10:05 AM
#7
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My favorite way to wire these is for 4th gear only lock up. No computer or vacuum switches needed for this method.
To do 4th gear only, leave the 2 prong pulse swith alone, as it serves as a pipe plug.
Replace the single prong switch that you currently have(normally closed) with the normally open type. I have the gm part number handy and can look it up if you like.
Make sure terminal A has 12 volt ignition power and leave that wire alone. Cut the ground wire on the solenoid and run it directly to the 4the only (normally open) switch in the v/b. That is all there is to it.
There are many aftermarket lock up kits out there, and I do not like any of them. Toggle switch arrangements become a pain in the nuts very quickly. Vacuum arrangements suck as well.
To do 4th gear only, leave the 2 prong pulse swith alone, as it serves as a pipe plug.
Replace the single prong switch that you currently have(normally closed) with the normally open type. I have the gm part number handy and can look it up if you like.
Make sure terminal A has 12 volt ignition power and leave that wire alone. Cut the ground wire on the solenoid and run it directly to the 4the only (normally open) switch in the v/b. That is all there is to it.
There are many aftermarket lock up kits out there, and I do not like any of them. Toggle switch arrangements become a pain in the nuts very quickly. Vacuum arrangements suck as well.
This is the arrangement I did on my buddies 84 corvette.
08-17-2007, 10:47 AM
#8
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Thread Starter
got ya, i probrably wont have any vacuum any wayz with a big cam LOL, thanks guys, INVALUABLE INFO! should be able to find the P/N easily, 
if the tranny doesnt last long, better get me one ready Pete!
if the tranny doesnt last long, better get me one ready Pete!
08-17-2007, 02:08 PM
#9
The switch you need is available through gm and ac delco.
The part number is the same for both
8642473
They are $12 or less
The 4th gear only arrangement is popular because it works well, and does not require any computer to work. Street rod guys love it.
Rest easy. I have a bitchen trans on the stand now. I hope yours holds up, but if not, I have you covered.....Pete
The part number is the same for both
8642473
They are $12 or less
The 4th gear only arrangement is popular because it works well, and does not require any computer to work. Street rod guys love it.
Rest easy. I have a bitchen trans on the stand now. I hope yours holds up, but if not, I have you covered.....Pete
