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Topic Review (Newest First)
08-19-2012 10:14 PM
JohnTN As SSedan said. You don't have to cut any wires. There is already a handy source of fused power going into the brake switch -- the little plunger under the dash that the brake pedal arm presses against when the pedal is pushed.

This switch has a hot feed going in and two male tabs for power out - one tab is normally open (doesn't get power until the brake pedal is applied) and sends power to the brake lights. The other tab is normally closed (supplies power when the brake pedal is not pushed down) and it used to power cruise control or power to the TCC lockup.

Start with a wire with a female connector crimped on and run it from the normally closed male connection to one side of a toggle switch. Connect another wire to the other connection on the toggle switch and run it out through the firewall to the TCC connection on the side of the trans. That will provide power to the TCC if the brake pedal is not depressed and the toggle switch is in the On position.

Like I said earlier, you can also run the wire from the toggle switch thru a vacuum switch before going to the trans if you want to have the feature that disconnects the TCC lockup under high throttle (low vacuum condition).
You get the vacuum signal from one of the nipples on the carburetor -- some like ported vacuum which disconnects TCC if you take your foot off the throttle, others like manifold vacuum which remains high when you let off the throttle and keeps the TCC locked up as long as you don't brake.

08-19-2012 07:05 AM
Originally Posted by gsoleski View Post
alright sounds good. I've heard you need to connect A to a fused ignition source? How can I do that? Splice a wire to an ignition wire and put an inline fuse on it between the splice and the trans? Or an open spot in the fuse box?
84/Z-28 should have the 4-Terminal Brake switch that's already fused. Connect to that. The Terminals needed will cut 12V+ when Pedal is depressed. Install a Toggle switch inline for around town driving if wanted to disengage TCC Lockup manually.
08-17-2012 11:55 AM
gsoleski alright sounds good. I've heard you need to connect A to a fused ignition source? How can I do that? Splice a wire to an ignition wire and put an inline fuse on it between the splice and the trans? Or an open spot in the fuse box?
08-17-2012 09:32 AM
SSedan64 X2^^,
Running 12V+ thru the Brake switch does help if you have to stop quickly when in 4th gear. Otherwise the TCC doesn't disengage until the Trans downshifts out of 4th. It would be like slamming on the Brakes & not pushing in the Clutch with a Manual Trans.
Newer 700R4s have more Pr. switches & will Lockup in 2nd, 3rd & 4th if the internal wiring isn't changed.
08-17-2012 09:11 AM
JohnTN At a minimum, run the power through the brake switch Normally On connection so that the TCC disengages when you hit the brake.

There are other switches you can put in series in the power line to make TCC lockup more driver friendly such as: vacuum switch and vacuum or timer delay switch.

08-17-2012 07:08 AM
sw for lockup..

just don't forget to turn it OFF when u come to a stop..
08-16-2012 10:19 PM
SSedan64 Normally just Ground Pin-D and 12V+ to Pin-A at Trans plug.
Info >>
08-15-2012 07:22 PM
bigdog7373 Yes. I saw a car with a lockup toggle switch on the shifter.
08-15-2012 01:11 PM
TC lock up idea. Would this work?

When I took the computer out of my car I cut the three red, brown, and green wires going to my 700r4. I'm assuming these are power and ground for the lock up? Can I use these three wires and run a toggle off them to make the converter lock? Car is an 84 Z28 if that matters

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