Thread: Wires everywhere !!!

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Ive got a butchered wiring harness in a 90 chevy full size truck. I'v found everything except the lower oil sending unit wire(neer the filter) Does any one know what color wire im lookin for? Chilton manual says tan / no tan wire available . Call me a wuss if you must but im tired of lookin plz help!!!

looks like its orange in my diagram, or is there two pressure swithes, one for the fuel pump and the other for the guage?

There is two .One for the fuel pump neer the distributor and the one I need is neer the filter .A single wire deal/scary part is my chevy looks like a ford sending unit I know its right it just looks scary...

Originally posted by 53 Chevy5
looks like its orange in my diagram, or is there two pressure swithes, one for the fuel pump and the other for the guage?

1 sending unite. the fuel pump and the gauge is the same one.

Originally posted by Big Daddy T
There is two .One for the fuel pump neer the distributor and the one I need is neer the filter .A single wire deal/scary part is my chevy looks like a ford sending unit I know its right it just looks scary...

dont know what that is at the dist but the fuel pump- oil perss. switch should be the same. ground the wire and see if you gauge in the truck goes all the way over. if it does thats the right wire and your gauge in the truck is ok to.

Thats the prob No extra wires opened loom to see if it was tucked cant find anything.

Originally posted by 53 Chevy5
looks like its orange in my diagram, or is there two pressure swithes, one for the fuel pump and the other for the guage?

have you got a diagram chevy5, the more i think about it there might be 2 senders. the only one i ever replaced was the fuel pump unite. i dont have a diagram i can look at right now. i can get you a diagram tomorrow Big Daddy T if you need it.

Originally posted by Big Daddy T
Thats the prob No extra wires opened loom to see if it was tucked cant find anything.

is this a computer motor or has all that been taken off?

I would greatly appreciate it 10 the one in chilton book is screwy. I have installed car sterios for about 15 years .Wires dont scar me but computer wiring is a mess...

Its possible that it is missing. The truck has not been converted to carb just the guy who put the motor in was a idiot...

Originally posted by DennyW
Maybe the wire you need is all together missing from the harness.

if its missing and we can find out the color of the wire, he can either put a manul. gauge on it or pull the speedometer out of the truck and run a wire from the wiring harness( oil pressure gauge in the dash) out to the sending unite on the motor. the ground will take care of it self.

Originally posted by Big Daddy T
Thats the prob No extra wires opened loom to see if it was tucked cant find anything.

ill get it tomorrow. its a 1990 - 350 right

Yea Ty 10

Originally posted by lt1s10
have you got a diagram chevy5, the more i think about it there might be 2 senders. the only one i ever replaced was the fuel pump unite. i dont have a diagram i can look at right now. i can get you a diagram tomorrow Big Daddy T if you need it.

i'm looking at your diagram now and there almost has to be two of them. the only one i can find i this diagram is coming off the D terminal on the fuel pump relay connects the circut at the switch and then goes to the B terminal on the relay.

Originally posted by 53 Chevy5
i'm looking at your diagram now and there almost has to be two of them. the only one i can find i this diagram is coming off the D terminal on the fuel pump relay connects the circut at the switch and then goes to the B terminal on the relay.

that diagram i sent you dont show the oil sending unite on the block does it?