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2 Bosch relays for cooling fans- series or parallel?

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turboAWDfanatic

20+ Year Contributor
347
35
Aug 22, 2005
Colorado Springs, Colorado
I've got 2 spal fans that I want to have turn on/off simultaneously. When I was using just one spal fan, I had a Bosch relay sending 12v to the fan, and used the factory fan wiring to switch the relay on/off (same principal as the fuel pump rewire). Now that I have a second spal fan, I have two bosch relays, but I'm not sure whether to wire them in series or parallel. I figure it doesn't matter any as far as voltage or amperage since its simply to switch the relays on/off, but the only issue I can think of is that if I wire them in series and one relay fails, the other will shut off. With that in mind, I think I want to wire them in parallel.

Hope that makes sense. Any thoughts?
 
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