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Old 11-01-2008, 02:33 PM
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Connector ident?? 86, GM 305 monte carlo

I removed the 305 from my 86 monte many years ago and recently found this connector burried between the tranny and block. Anyone know what this might have been for? I know that my stock oil gauge doesnt work or maybe it was a knock sensor? I dont see any missing wires on the tranny which is a 2004r.

This car has no computer anymore and all gauges work except the oil pressure. The connector has only 2 female plugs as you can see and is about 3/4" in the center



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Old 11-01-2008, 10:43 PM
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Both the GM knock sensors and oil pressure senders that I've seen are a single wire connector.

That connector looks like it would connect to an oil pressure switch like I have on my '86 Firebird - it was originally an EFI 2.8 V6 with in-tank pump. I'm guessing that your small block for that year came with a mechanical pump right?

The wiring on the connector in my case is fairly heavy, heavier than you would see on a sender for a dash instrument. It runs the pump directly through the pressure switch.

Sure looks like the same connector though!
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Old 11-02-2008, 01:18 AM
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i believe that connector is for the oil pressure & choke switch.
they used the same switch to turn on the oil & choke lights when there wasn't any oil pressure. it also supplied power to the choke coil once it was closed by the oil pressure.
there was also a wire from it going to the ECM for idle speed control.
the switch was mounted in the block by the distributor.
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Old 11-02-2008, 09:10 AM
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Thanks. Sounds about right. It has 4 wires going into it but only 2 connectors on it. Im going to cut it off but save the wires for future use
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Old 11-02-2008, 08:22 PM
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no problem
one of the brown wires goes to the 20 amp C/H fuse in the fuse box and is hot with the key on.
the other brown wire goes to the ECM.
the tan wire goes to the oil/choke light.
the light blue wire goes to the choke coil.

be sure to tape the ends of the 2 brown and the tan wires up so you don't have a short or a flickering oil/choke light.
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