Transposing Relay Wiring

[1987 GMC Jimmy]

I’ve had a months long electrical gremlin with the wires that go to the relay that controls my dashpot/idle up solenoid/fast idle solenoid, and something’s shorting out and blowing my ECM-I fuse. I did a “field dressing” when I was away from home that actually lasted a few months. When it happened again, I fixed it correctly, and it lasted about a day. I figured I’d just get a universal relay and pigtail and be done with it, but I’m having trouble with the coil portion of the diagram (pins 85 and 86). Any thoughts? If I had a wiring diagram for this, I’d be set, but unfortunately I couldn’t find one anywhere. 3 and 4 are getting twelve volts, but I thought I was supposed to be getting twelve to five, and there was negligible voltage there. I also thought one side of the coil was supposed to go to ground.

1=87
2=87a
3=?
4=?
5=30

You must be registered for see images attach

You must be registered for see images attach

 

[gmachinz]

Yes 3 and 4 would be a 12V input trigger and a ground. Unless there is a diode it wont matter which is which on the generic relay-not so sure on the GM relay tho-I’d have to check my illustrations.

 

[1987 GMC Jimmy]

Crap. Then something’s wrong or the diagram’s wrong. Could damage in the original connector cause the voltage to jump over one? And I thought the pin giving me less than a volt should be a 12V constant as well. I can make sure the fuse didn’t blow again, but I was getting power to the ECM while testing so it shouldn’t have.

 

[1987 GMC Jimmy]

Went ahead and wired it as best I could, the dashpot works again, and there’s no ECM-I fuse short (for now). OEM relay number is 14078915, aftermarket connector is S615. GM used this relay on various cars and trucks throughout the 1980s for the air injection, fuel pump, and/or controlling the carburetor dashpot as in my case. I saved some money going the universal route, and I’ll attach my work below.

You must be registered for see images attach

 

[Backfoot100]

According to DIN standards 85 is ground and 86 is 12V.
Should be easy to ohm out from the relay to the connector to determine which is which on the connector.

 

[73c20jim]

1=87
2=87a
3=?
4=?
5=30

You must be registered for see images attach

You must be registered for see images attach

3 & 4 are the trigger wires as already said,

When the relay is at rest 5 & 2 are connected.

Trigger the relay and 5 & 1 are connected.