how to wire up a 12 volt/40 amp relay for eletric fans on a toggle switch? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-08-2003, 05:52 PM
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how to wire up a 12 volt/40 amp relay for eletric fans on a toggle switch?

Got a 5 connector hella relay (little black square style).
has numbers 87, 87a, 85, 86, 30. on it and I have no idea what they stand for as far as the hookup.

Im trying to wire up a pair of 12 inch eletric fans and any help would be great.

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Old 09-08-2003, 06:57 PM
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i found a page that has a 5pin relay like yours.

it looks like the control circuit is run by using 85 & 86

the switched circuit is on 30 and 87/87A. (one in, two out)


www.20v.org/relays.gif


hope this link works.

JB
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Old 09-08-2003, 07:09 PM
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The #30 goes to Battery Positive, #85 goes to ground, #87 goes to the fan, #87a is empty in most cases, #86 goes to the toggle switch. I usually use a fusible link to the battery. In case there is a short it will burn before you fry your system. I just wired up a single pusher fan this weekend using this same set up. The fan works great, I'm still running hot but the fan works great.
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Old 09-08-2003, 07:54 PM
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Thanks guys...
This place is great for info sharing
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Old 10-02-2003, 08:24 PM
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be sure to switch the ground side with the switch.
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