C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

unplugged plug? possibly a missing relay?

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Old Oct 5, 2013 | 01:50 PM
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Default unplugged plug? possibly a missing relay?

(1985 CORVETEE) this is located around the booster and wiper motor and no its not the overdrive thats plugged in and the one mounted on the wheel well is plugged in too

Last edited by 85corvettec4; Oct 5, 2013 at 03:03 PM.
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Old Oct 5, 2013 | 01:58 PM
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Do you have the fuel pump relay in that area??????

There is another plug that goes into the distributor on the underside????

IF either of these were not plugged in, I would not think the car would run.
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Old Oct 5, 2013 | 02:00 PM
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ya the overdrive and fuel pump use the same relay as im told. and my dizzy is pluged into computer
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Old Oct 5, 2013 | 02:02 PM
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do they share a relay or use the same one?
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Old Oct 5, 2013 | 02:02 PM
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On mine one relay is for OD, and the other is the fuel pump. Like I offered before, I will gladly help you with it. All you gotta do is ask......Then you can help with my ls swap. Lol. Peace brother! h
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Old Oct 5, 2013 | 02:04 PM
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this connector is quite a bit bigger then the OD connector and its gray. as soon as i put an ls in mine id be glad to give you a hand
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Old Oct 5, 2013 | 02:05 PM
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this is my od/fuel pump
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Old Oct 5, 2013 | 02:17 PM
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There should be 2, one for fp, and one for od. Take a pic a little farther back so we can see what else is in there. I'll check mine to be sure.

There is a wiper connection in that area too

If you do need any help, I'm a half hour away. h
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Old Oct 5, 2013 | 02:23 PM
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i appreciate that man, but i got it running now this is the only thing left. i was about to take her out when i found this plug. the fuel pump and od use the same relay this connector is much larger
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Old Oct 5, 2013 | 02:24 PM
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it comes out seperately from the driver side wire loom in between booster and battery.

Last edited by 85corvettec4; Oct 5, 2013 at 02:28 PM.
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Old Oct 5, 2013 | 02:28 PM
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Sorry for the double post. I will go look at mine, and be right back. h
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Old Oct 5, 2013 | 02:44 PM
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Originally Posted by 85corvettec4
it comes out seperately from the driver side wire loom in between booster and battery.
I don't have anything like that on my '87. Also, the orange wire nut sticking out from the black tape wrap is clearly not OEM. I would bet that the gray connector is tied to that wire nut somehow. Possibly a previous owner's wiring hack job.

Originally Posted by 85corvettec4
this is my od/fuel pump
As you have seen, the OD relay and the FP relay are the same part. Definitely get those bare wires cleaned up and covered GM used a black tar type of sealer on these connectors and over the years the stuff dried out and it cracks. The wire covers get hard and they start to break leaving bare wire. I think that replacement connectors and terminal ends are available so it might be a good idea to start replacing them.

I would suggest that you get the Factory Service Manual books to help with identifying the electrical stuff. One of these books has all of the wiring diagrams by component showing what is controlled and where the harnesses are located on the car. There's also a section with pictures of each wire connector and what it's used for. There is a specific troubleshooting section for all the electrical components. It will go a long way to help with identification and how to fix stuff.
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Old Oct 5, 2013 | 02:49 PM
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i cleaned that up i saw it and was wondering what the hell happened. the nut im pretty sure was from the in cabin fuel pump switch before i took the carburetor off. ill get into the book and take a peep
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Old Oct 5, 2013 | 03:58 PM
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tore through the book and wiring diagrams and i do not see it in there anywhere
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Old Oct 5, 2013 | 04:59 PM
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Cruise control?

Last edited by Cliff Harris; Oct 6, 2013 at 01:45 AM.
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Old Oct 5, 2013 | 05:15 PM
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i think po removed the CC so that actually might be it
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Old Oct 5, 2013 | 09:02 PM
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Originally Posted by Cliff Harris
Cruise control?
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To unplugged plug? possibly a missing relay?

Old Oct 5, 2013 | 10:13 PM
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Yes, that is the cruise plug.
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Old Oct 6, 2013 | 04:14 PM
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Originally Posted by 85corvettec4
this is my od/fuel pump
If I may, I would like to clear up any confusion your description might spur...the relay pictured above is the FUEL PUMP relay only, and has nothing to do with the OVERDRIVE relay. They are two separate units, and the OD relay is found on manual transmission cars only, and are not found on automatic transmissions cars.

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Old Oct 6, 2013 | 05:35 PM
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Originally Posted by White87
If I may, I would like to clear up any confusion your description might spur...the relay pictured above is the FUEL PUMP relay only, and has nothing to do with the OVERDRIVE relay.
What he should have said was the pump relay and the O/d relay use the same replacement part #
You can interchange the relays in their respective positions for testing purposes

Last edited by vetteoz; Oct 6, 2013 at 05:38 PM.
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