Rick Williams
12-10-2011, 03:32 PM
My donor was a 2000 auto. I’m trying to understand the cruise control wiring and have been using the write-up from this post. http://www.ffcars.com/forums/42-factory-five-gtm-forum/86685-cruise-control-instructions.html . I understand the stalk mounted wiring and the VSS wiring but the brake switch wiring is killing me. I have the brake light switch which has two connectors. One is for the brake lights and according to my Vette manual, the other is for the auto transmission shift lock. I assume this one won’t allow you to shift in or out of park unless the brake pedal is depressed. The second switch gets a connector that has two pinks, a purple, and a gray. The purple is the one that the write-up says disengages the cruise when the brake pedal is depressed. Problem is, I can find no reference to this switch in the cruise control section of the Vette manual nor do I see it in the cruise control schematics. After a lot of digging I found out that it is a torque converter and extended brake travel switch. The two pinks are 12V. The schematic shows the gray as the extended brake travel signal and the purple as the torque converter signal. This conflicts with the write-up that says it’s for deactivation cruise when the brake pedal is depressed. Does this switch serve a dual function in that it also kills cruise when the brake is depressed or is cruise deactivated when there’s a 12V signal from the light blue wire (from brake switch) to connector C2, pin F1?
Second issue. I’ve checked both switches. For the brake switch I have an open circuit when the plunger is depressed and a closed circuit when the plunger is extended. That’s as it should be and will feed power to the brake lights when the brake pedal is depressed. The other connector pins (auto trans shift lock) on the brake switch are the opposite. There’s a closed circuit with the plunger depressed and an open when extended. Problem is, on the torque converter/extended brake travel switch the pink to gray circuit opens when the plunger is extended but pink to purple doesn’t do anything regardless of where I move the plunger or which pink I try. Bad switch?
Let’s assume I need 12V through the purple wire to fuse box connector C2, pin B6 and I have a bad switch. Why can’t I just splice the purple wire onto the unused transmission shift lock switch? It has 12V unless the brake pedal is depressed so it should do the same thing regarding cruise cut-off.
Confused…So am I.
Second issue. I’ve checked both switches. For the brake switch I have an open circuit when the plunger is depressed and a closed circuit when the plunger is extended. That’s as it should be and will feed power to the brake lights when the brake pedal is depressed. The other connector pins (auto trans shift lock) on the brake switch are the opposite. There’s a closed circuit with the plunger depressed and an open when extended. Problem is, on the torque converter/extended brake travel switch the pink to gray circuit opens when the plunger is extended but pink to purple doesn’t do anything regardless of where I move the plunger or which pink I try. Bad switch?
Let’s assume I need 12V through the purple wire to fuse box connector C2, pin B6 and I have a bad switch. Why can’t I just splice the purple wire onto the unused transmission shift lock switch? It has 12V unless the brake pedal is depressed so it should do the same thing regarding cruise cut-off.
Confused…So am I.