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Are Fan Relays SPST?

popsrcrpopsrcrMember
Thanks to the photos and diagrams on Pantera Place, I have figured out some of the odd wiring in my relay panel. In short, I think the are bypassed. Maybe this was a common mod? Wires are pulled off the relays and jumpered together. Also a wire was spliced into the non-fused feed side of the fuse panel, had an inline fuse, and it then joined one of the wires that was removed from a relay.

So, I can figure out how it was all supposed to be. What I don't know is if the relays are any good. I've never tested relays before, but Mr. Google makes it look straight forward. ARe the fan relays simple SPSTs? I *think* they are?

Thanks
Kermit
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J jb1490Member
quote:
Why are all the relays physically different? Pass more or less current or something?

Good questions. Of the four SPST relays in the '71 cars, only one is different...the horn relay. The horn relay is only a three terminal relay, as the +12v is connected (internally) to the line side contact and to one side of the relay's actuating coil. The other side of that coil is grounded when the horn switch is manually activated.

John

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popsrcrpopsrcrMember
That is the later relay panel, yes? My wire colors lined up with the early one on Pantera Place, but not this one. I think where this has yellow on the fan relays, I have green/black. A few other differences as well.

So, I kind of assume a PO wired the fans so they would come on all the time (which, at least one of them did as soon as I turned the key). But, I figure I should test the relays to be sure, then buy a horn relay.
And a horn, for that matter.

I enjoy this, but it is slooooow going.

Thanks
Kermit

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