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Old 03-19-2010, 01:34 PM
TrePaul86 TrePaul86 is offline
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Default Relay wiring

I have a buddy of mine doing a electric fan swap on his 67 chevy, so he can run his B&M blown 454... The mechanical fan isn't going to cool it enough and it's too big. So he ordered up some relays, some elcetric fans and a few switches.

What he wants to know is, if there's a way you he can run 2 fans off 1 relay using both switches? Like turn on one fan with one switch, through the relay, then if he needs his second fan to flip the other switch using the same relay to power the other fan?

He has no problem doing each fan per relay, but the instructions say he will have no problems running 2 fans on 1 relay...

Any help would be great. Thanks guys.
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Old 03-19-2010, 02:17 PM
Jimbo Jimbo is offline
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Default Re: Relay wiring

Interesting question. The relay acts as a non-mechanical switch between the mechanical switch he'd turn on and the fan. If he turns on the fan switch whatever is connected to the relay would activate. So, if both fans are wired to the relay both would turn on when the switch is activated. The only way to do it with one relay would be to wire the second switch between the relay and the second fan. But the only problem with that set up is that you are defeating the purpose of using a relay to begin with. Relays are for higher load components..... I would do the two switch two relay set up.....but I'm just a novice. Wouldn't there be a way to wire in a temperature switch to kick on the second fan if the temp got to high? In other words, when the switch is on the first fan gets juice and juice is also sent to a temperature sending unit that would activate the second fan when temp gets too high? Just some thoughts.
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Old 03-19-2010, 02:51 PM
TrePaul86 TrePaul86 is offline
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Default Re: Relay wiring

Yeah I know about relays and how they wire, I just didn't know if something like that was possible... He's going to mechanically control the fans separately to monitor temps. It's his weekend/car show truck.. Only goes out on nice days, 500hp+... It's lined with gauges so he's constantly looking at the readings from each one.

I told him I didn't think it was possible to wire it like that, but figured I'd check. I too suggested just doin the dual relay dual switch setup. But he does want them wired individually to control temps better.
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Old 03-19-2010, 02:56 PM
Jimbo Jimbo is offline
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Default Re: Relay wiring

Any pics of the monster?......love old chevys.....had a few 67 chevelle's back in the day
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Old 03-19-2010, 02:59 PM
Jimbo Jimbo is offline
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Default Re: Relay wiring

Oh yeah....didn't mean to sound too basic in the post......Hell,,,,,,I know enough to be dangerous....LOL
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Old 03-19-2010, 03:03 PM
TrePaul86 TrePaul86 is offline
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Default Re: Relay wiring

When I run out there in about an hour, I'll snap a few pics.. I took a vid of when he fired it up before he had the radiator on... It sounds freakin mean... it's got a 3500 stall speed in it too... He hooked up the radiator and filled it with coolant yesterday afternoon and took it around the block.. He said it's scary to ride in/drive... Says you can't grab a dollar bill off the dash. lol
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