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Old 05-26-2007, 02:00 PM
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quick wiring/relay question

I'm just wondering what each of these numbers on the diagram on this relay are. Apparently I have no idea how to read electrical diagrams and I don't want to ruin this relay. It's on the right bottom side. #85, #86, #87, and #30

I know there's going to be a ground, supply power, remote power, and output but no idea which is which.

Thanks a lot,
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Old 05-26-2007, 05:11 PM
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Doc here,

The numbers are :
  • 85 = Coil power or ground.

  • 86 = Coil power or ground.

  • 87 = Normally open contact.

  • 87a = Normally Closed Contact.

  • 30 = Center wiper.

Doc
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Old 05-26-2007, 06:54 PM
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thanks doc

ok so how would that translate in to use for an electric radiator fan?

i would imagine 85 or 86 are the ground and a remote power? which would be which?
87 is power to the fan?
30 is direct power from the battery?

something like that?

thanks
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Old 05-26-2007, 07:32 PM
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85---12v ignition
86---fan switch (grounds when coolant is up to temp)

30 to the fan
87 to the battery

I think this is how Doc recommends the hookups. (to prevent accidental shorts when working on the circuit)

If you have AC---you will want to install another relay to activate the fan when the ac compressor is engaged.

Bryan
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Old 05-26-2007, 09:55 PM
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awesome, thanks a lot!
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Old 05-28-2007, 02:33 AM
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Doc here,

Additional information:

Be sure the fan wire and the battery support wire for the fan Via the relay, are 10 gauge, or your shooting yourself in the foot..you need the higher gauge wire to support the fan draw through the relay. (pins #30 and #87)

Be sure the Wire that runs to the source current, (pin # 87) has a proper fuse link OR maxi fuse on it..

The relay coil wires may be 12 or 14 gauge..or Even as small as 18 gauge.

Doc
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