PaceCarTN

78 Pace car

I thought I would just follow the wires from the switches to the relay, but oh no that would be too easy.

I have a silver box mounted right under the cigarette lighter; it has a large Pink wire plugged into the top, then Orange with a black stripe under that, then a smaller pink wire with a black stripe under that. Is this the Power Window Relay? Someone said that it should be back by the radio, but I don't see anything back there.

I called around to the parts stores in town, they say they don’t even have a listing for it. Chevrolet parts is not open (Of course).
Wonder if this is a part I’ll have to get from Ecklers or some were like that?

Scott78

Looking at a wiring diagram it describes the relay as having:
A 20 gauge pink/blackwire, a 12 gauge orange/black(theses 2 wires in a single connector) and a 12 gauge pink connected to it. So it sounds like thats it. Hope that helps
Scott

PaceCarTN

Thanks Scott,
From that diagram can you tell me what wires I could jumper together to by-pass this relay long enough to see if that’s what’s bad?

Scott78

Yep the 12 G pink is the wire going to the center post of both window switches, so it's the power to the motors thru the switches. The Orange/Black is from the batt so is a constant hot and the Pink/Black is hot when Ign is on as a signal to relay to function when Ign is on.

If I'm reading this diagram right, the relay's only funtion is to act as a switch from a batt source that is"closed" when Ign is on. So full motor load is thru switches and not farmed out thru relay. Hope tht helps
Scott


[Modified by Scott78, 3:38 PM 7/27/2002]


[Modified by Scott78, 3:39 PM 7/27/2002]

PaceCarTN

Is this it?
Sorry for the stupid questions, but I’m a toolmaker not an electronics guy.
However, I do have a Fluke Multimeter if there’s a way to check this relay. :)

Thanks,
Dave

Nomad78SA

Here is a link to a on-line 78 electrical manual that another forum member posted a while back. Can find everything you need to know..
Neil in Tenn

http://www.corvetteforum.net/c3/tune...l/index6.shtml

Scott78

This might help a little


if you apply 12v to the terminal the pink/black wire is connected to with the case grounded. You should have no resistance thru the 2 other terminals.
Applying power to that terminal closes the contact points.

Scott

PaceCarTN

Scott,
Sorry I was posting at the same time.

So if I hook the 12G Pink to the Orange/Black I have power to the switches whether the ignition is on or not and have by passed the relay. Should be able to hit the buttons and roll the windows down. :eek: :confused:

Scott78

Thats how I see it.

Scott

PaceCarTN

Scott,
That worked. Both windows rolled down, although they were slow and the jumper wire got hot. :eek:
But that tells me the relay is bad. Now if I didn’t burn anything :crazy: up all I have to do is find a relay.

Thanks a lot for the help. :cheers:
Dave