Dual Electric Fans---Two Relays...Or Three Relays?

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01-24-2011, 04:36 PM

LS1GMCTruck

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Dual Electric Fans---Two Relays...Or Three Relays?

2001 F-Body Computer, with 2001 Dual electric fans. Should they be wired using two relays, or three? And why? (Only one of my fans come on.)Thanks

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01-24-2011, 04:39 PM

ebk06

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they can be wired either way. the 2 relay way only allows the fans to operate at one speed. the 3 relay way they run at two speeds.

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01-24-2011, 07:02 PM

aknovaman

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2 relay setup operates one high speed fan and one low speed fan.
3 relay operates both fans electrically in series for low speed and one for high speed.

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01-25-2011, 07:17 AM

bjamick

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01-25-2011, 11:13 AM

Andy1

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I like the three relay method, as two fans at low speed (run in series) are quieter than one fan at high speed (two relay low method), IMO.

Andy1

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01-25-2011, 03:44 PM

LS1GMCTruck

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Thanks for the great replies everyone. I have mine wired via two relays & the second fan never comes on, ever...even with the A/C turned on. What could be my problem, or what do I need to do? thanks

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