Relay Question
January 28th, 2009, 11:31 AM
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Relay Question
Hi, I have a '91 S-10 4.3 L 2WD. I need to know which terminals on the A/C relay are the power terminals. The larger ones or the smaller ones. Thanks! Kevin
January 29th, 2009, 9:11 PM
#2
CF Monarch
Pop the cover off the relay and see which terminals connect to the coil of wires inside.
If you can't open it, use a couple of wire jumpers, one to a 9-12v positive and one to a 9-12v ground (a good flashlight battery or 9v battery should suffice) Then jump the terminals. Start with one terminal at random. Hook it up to the - terminal. Jump each of the others to + terminal one by one.
If you don't hear a click (the relay switch engaging), its a power terminal. Go to the next one and so on until you figure out which ones are power and which are control.
Relays are automatic switches that allow closure of a circuit without running high amperage through the manual switch. There is a coil of wire inside the relay that creates a magnetic field when a low amount of current is applied to it via a manual switch. The magnetic field pulls the contacts of the power circuit closed, completing the circuit to the power accessory. When the control circuit is de-energized, a spring opens the power contacts and cuts power to the accessory.
If you can't open it, use a couple of wire jumpers, one to a 9-12v positive and one to a 9-12v ground (a good flashlight battery or 9v battery should suffice) Then jump the terminals. Start with one terminal at random. Hook it up to the - terminal. Jump each of the others to + terminal one by one.
If you don't hear a click (the relay switch engaging), its a power terminal. Go to the next one and so on until you figure out which ones are power and which are control.
Relays are automatic switches that allow closure of a circuit without running high amperage through the manual switch. There is a coil of wire inside the relay that creates a magnetic field when a low amount of current is applied to it via a manual switch. The magnetic field pulls the contacts of the power circuit closed, completing the circuit to the power accessory. When the control circuit is de-energized, a spring opens the power contacts and cuts power to the accessory.
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