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Old 04-01-2009, 09:24 PM
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Oil pressure sensor/temp wire colors?

1984 Chevy El Camino, 305 auto. Recently replaced the engine and among many other things, installed a new temp sensor and oil pressure sensor. I don't know that the old sensors were hooked up when I removed the engine, but I do know that my guages did not work before I removed the engine and they don't work now. I have two wires that are unused on the drivers side of the engine (where the sensors are) and I'm wondering if that's they go to. Neither of them have a connector on the end (they look like they've been buggared up a little). It may well be that the guages are bad, but I'd at least try to hook them up and see what I've got.

Does someone know or can someone look at their engine and tell me the color of the wires going to the sensors?

Thanks,
Jag

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Old 04-01-2009, 09:51 PM
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If you have a voltmeter you can check the wire for voltage with the key on. It should read less than 12 volts, 8 or 9 is usual for gauges..If the wire shows a lower voltage than the battery, (which should be at least 12.5), ground it the wire and it should peg the gauge that it is supposed to sense.

You can also hook a test light between one of the suspect wires and ground... it should light up kind of dim and when it is connected, that will peg the gauge as well.

That is an easy way to see if those wires are for your gauges.

Later, mikey
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Old 04-01-2009, 10:21 PM
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Thanks Mikey....I'll give that a try tomorrow

Appreciate the info. I'll give that a try tomorrow. BTW, the oil pressure guage is usually pegged (before and after swap). Could it be going to ground already?

Thanks again,
Jag
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Old 04-01-2009, 11:05 PM
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Quote:
Originally Posted by jagurit
Appreciate the info. I'll give that a try tomorrow. BTW, the oil pressure guage is usually pegged (before and after swap). Could it be going to ground already?

Thanks again,
Jag
It sounds like it is, does the gauge drop down to 0 when the key is off? You said "usually" if it acts right sometimes and other times it's pegged, it could have an intermittent ground, such as a wire with worn insulation that is dragging on a inner fender or other ground...or you could just have really high oil pressure. My 73 blazer has a high volume high pressure oil pump (whole 'nother subject ), and with 10-30 it is pegged at anything above an idle.

Later, mikey
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Old 04-02-2009, 01:45 AM
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Heres a wiring diagram for an 84 Elco. Might help.
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Old 04-02-2009, 02:05 AM
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Sorry, try again

Dang, still nothing. I give up. Let me know if you need the diagram and I'll try again.
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Old 04-02-2009, 02:13 AM
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Ahhh. Figured it out. Got to save it in old Word format
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File Type: doc 84 El Camino wiring diagram #1.doc (255.5 KB, 107 views)
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Old 04-09-2009, 08:31 PM
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Thanks!

Sorry I hadn't gotten back and updated this earlier. I do appreciate everyone's help. Tried to find a live wire, but both of the ones hanging down were dead. I think one of them went to an old alarm system that I disabled a couple of years ago.

Anyhoo, to make a long story short, I bought some mechanical gauges and installed them. Mounted them where the ashtray slid out (don't need that anymore anyway). Looks pretty decent and they work great.

Again, thanks for all your suggestions and help.

Art
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