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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...
1 sending unite. the fuel pump and the gauge is the same one. :cool:Quote:
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?
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.:HMMM:Quote:
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...
Thats the prob No extra wires opened loom to see if it was tucked cant find anything.
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.:HMMM:Quote:
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?
is this a computer motor or has all that been taken off?**)Quote:
Originally posted by Big Daddy T
Thats the prob No extra wires opened loom to see if it was tucked cant find anything.
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...
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.:whacked:Quote:
Originally posted by DennyW
Maybe the wire you need is all together missing from the harness.:(
ill get it tomorrow. its a 1990 - 350 right :cool:Quote:
Originally posted by Big Daddy T
Thats the prob No extra wires opened loom to see if it was tucked cant find anything.
Yea Ty 10
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.Quote:
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.:HMMM:
that diagram i sent you dont show the oil sending unite on the block does it?Quote:
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.
no, i cant seem to find it, mabey its shows it on the instrument diagram.Quote:
Originally posted by lt1s10
that diagram i sent you dont show the oil sending unite on the block does it?
thats only computer related so the oil switch wont show it show the fuel pump because its part of the computer . ill get the gauge diagram tomorrow. :cool:Quote:
Originally posted by 53 Chevy5
no, i cant seem to find it, mabey its shows it on the instrument diagram.
ok big daddy on a 1990 chev. pick-up with a 350 there is only one oil pressure switch. thats the 3 prong one on the side of the block. 2 of the wires goes to the fuel pump and one to the gauge in the dash. so if you have a plug for the one on the side of the block thats all you need. i dont have a diagram yet but if you have the 3 prong plug thats all you need. :HMMM:Quote:
Originally posted by Big Daddy T
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...
now i have a diagram but the print is so small i cant blow it up so you can see it, we'll try this.Quote:
Originally posted by lt1s10
ok big daddy on a 1990 chev. pick-up with a 350 there is only one oil pressure switch. thats the 3 prong one on the side of the block. 2 of the wires goes to the fuel pump and one to the gauge in the dash. so if you have a plug for the one on the side of the block thats all you need. i dont have a diagram yet but if you have the 3 prong plug thats all you need. :HMMM:
only 1 oil pressure switch on the block.
3 wire plug goes to it.
you should have a
1-GRN wire
1-TAN/WHT wire
1- TAN wire
the GRN should be 12 volts.
the TAN/wht goes to the computer ,so dont hook them togother
the TAN wire goes to the oil pressure gauge in the dash
you dont need for the 2 fuel pump wires to be hooked up to make it run. the pump should be running off of the reg. relay or its been by-passed anyway.
find the TAN wire and plug it on the top post on the switch and see if it works, or ground out the tan wire and see if it makes the gauge move in the dash. if it does then you know you'er right. :cool:
if he cant find that tan wire he needs to run a wire from the oil pressure switch on the motor to the tan wire in the plug at the back of the instrument panel. the ground will take care of it self. it will use the same ground thats it useing now. thats what id do before i spent a lot more time looking.Quote:
Originally posted by DennyW
Mike, that Tan wire is the one he said he couldn't find. Where does that Tan wire hokk to from end to end? :)Oh, never mind. It goes from the dash gauge to the oil sender, and that acts as the resistor to ground to vary the voltage .