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I'm doing some wiring on my 78 Corvette. Wondering what exactly this plug is for. I removed a rusted out component from it, it has 4 prongs that plug into it. Any help is appreciated! Thanks!
I'm trying to find out what kind of relay it is. And I've had no luck. I haven't even cranked the engine over yet. It was a roller. I put the car "On" and my turn signals will come on but not blink. I looked up a turn signal relay but it's not this. So I've got two issues now I guess.
I would say that relay will require some clean-up. Sorry dumb I know.
I will have a look in my AIM (it's at the shop).
Regarding your signals. If they come on but don't blink it may very well be a ground wire issue. Make sure the engine is grounded to the frame, the dash is grounded to the engine (or frame) and the frame is grounded to the battery.
Your ground wire probably goes from the battery to the alternator bracket, but the engine will not ground to the frame because it is all rubber mounted so needs a good ground for the engine to the frame.
I have that same plug in my 81 and have always wondered what it was for. Right now mine isn't connected to anything either. I looked over a few of my diagrams and believe that the plug is for either the rear defogger or the alarm system. I have never found the relay that it is supposed to connect to and it is likely that a previous owner removed it a long time ago.
Hopefully a wiring expert can clear this up for us.
Regarding the plug mentioned in the first post, I believe all 4 prongs are horizontal to one another (that is how it is setup in my 81). Looking at that relay it has both horizontal and vertical pins.
Would that plug fit the defogger relay in an 81 or was there a different relay for that year?
Last edited by Xliberater; Apr 29, 2015 at 12:21 PM.
the plug matches the schematic for the rear window defogger timer relay. looks as if that relay may have had 4 prongs, one has rusted off. that thing been soaking in water? http://www.corvetteforum.net/c3/tune.../index20.shtml
What is this plug for?
