04-02-2006, 06:01:04 PM
While installing power windows in my '77, I thought that I would try to get the existing power locks to work. Everything seems to check out - the solenoids work when power is directly applied and the switches and the wiring all have continuity, but when everything is hooked up nothing happens. :( I've looked at countless diagrams, but everything seems to be different from what I have. I only have 3 wires - orange, green, & black - and the switches only have 3 pins. I don't understand where the ground comes from when the switch is used. I feel like I'm probably missing some wiring or relay...?????:roadkill:
04-02-2006, 07:09:16 PM
There is a reversing relay somewhere around the lower steering column or near the kick panel. Normally with GM, orange is a power feed to the switch, black and Lt. Blue control the relay. Tan and gray power the solenoids. This is for later years though. What year do you have?
04-02-2006, 11:44:05 PM
Do you hear the lock actuators clicking??
My 78Z is doing the same thing, but I can hear them clicking.
The locking mechinism on the door is really gunked up and the actuators do not have enough umph to move it.
I have an extra lock mechinism that I cleand up and lubed. I will replace that and see if it works then.
04-03-2006, 09:32:28 PM
My car is a '77. No clicking at all & the mechanism moves very freely. The more I study the system, I must be missing the reversing relay. I looked all around under the dash & don't see one there. Anybody have a part number or know where to get one? Will one off of another '70's GM car/truck work?
04-04-2006, 07:27:34 PM
This is the wiring that should be in your car.
You might have the wrong stuff in your car.
04-04-2006, 07:36:25 PM
as you can see from the wiring diagrams, there is no relay in this system.
I am posting pics from my car (the interior as apart, so I can get the pics easy.)
Both switches should have 5 pins, you are reversing the polarity of the actuators by using the switchs.
Also, I believe that BOTH switches have to be there for the system to work.
04-04-2006, 08:52:24 PM
Anyone know where to get the terminal ends for these wires...the little clips that the pins push into. Mine are corroded. I don't want to replace all the wiring cause it's in good shape other than the terminal ends.
Since this is a weak spot that causes the PL to fail... others might benefit.
04-04-2006, 09:08:22 PM
Thanks so much fo the pics!!
Hmmmm, my switches and fittings that plug into them only use 3 pins. The wiring diagrams I've seen seem to show what's in your pictures. I'm pretty sure that what I have is oniginal to the car. The wiring runs through the plastic channel behind the dash and, trust me, from the amount of gunk, I seriously doubt that the dash has been apart before I got to it. But in a 29 year old car, who knows? No relay in your system?
Yeah, I've fought with those terminals before too. Love to know where to get some!