700R4 Lockup wiring - Team Camaro Tech
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post #1 of 2 (permalink) Old Sep 1st, 05, 08:01 PM Thread Starter
Join Date: Aug 2005
Posts: 52
700R4 Lockup wiring

I am looking this 86 camaro over and find this. I no longer need the computer for anything other than lockup. So the ckt looks like Pos Bat to one side of the made contact of the brake switch. From there a purple wire to trans. This wire supplies batery to one side of the lockup solonoid winding. The battery can be broken by the operation of the brake switch. Accomplished by stepping on the brake. So a complete ckt on this side exists at all times when brake switch is not activated.

Other side of ckt begins with a "fourth clutch switch, which has a contact with ground on it and another contact that makes with this when fourth gear is engaged. A sort of sensor that acts as a relay to supplu a GRD to the computer. Dark green wire.

Now what happens in the computer? Have no idea. If this grd were an normal grd, and I dont know wether it is or not, I could hook it directly to the other end of the coil of the solonoid ( now tan black wire) and activate this lockup every time fourth is activated and the brake is not being used.

WHAT DOES THE COMPUTER ADD TO THIS TO MAKE ITS DECISION? Are the ckts not straight 12 volt and grd style or something? Does the computer have an input from other sources such as throttle position sensor and such? Is there a vacuum sensor I could purchase that would make or break the connection correctly so that lockup would happen and unlock to accelerate and such?

It seems that one could just wire this himself if the system was all battery and ground and one knew where to purchase the vacuum sensor-relay??

Any takers to help me think??
William van Hulst is offline  
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post #2 of 2 (permalink) Old Sep 1st, 05, 10:40 PM
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Join Date: Aug 2004
Location: PA
Posts: 819
Re: 700R4 Lockup wiring

The computer uses throttle position, vaccuum, and speed to decide when to lock the converter. The one in my truck will lock in drive as well as overdrive. They do sell kits with a speed sensor.

69 RS 355 Tremec 5-Speed 4.11's
12run is offline  
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