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Old 05-01-2017, 08:49 PM   #1
gsxgsxgsx
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Trying to wire in a relay for fans

My voltage drops way too much when both of my cooling fans kick on causing my idle to significantly drop when my voltage drops when the fans kick on. I was told by a local tuning shop that I should wire in a relay. I am not the best at electrical and need some knowledge about how to actually wire this in correctly. I am aware that I probably wired in my fans incorrectly and caused this issue in the first place but I am unsure on how to wire both fans and the relay correctly to not have my voltage drop and idle drop when the fans kick on as well as not burn up my wiring harness.

Pictures below are of the current wiring situation, and the relay that I was told to use. Coming off the main wire harness the fan plug/coolant sensor goes to one fan, and I had spliced into the power/ground of that same line to go to the other fan - they're all from the same source.

Should I run a second power line from my battery for the second fan? From what I can find I believe the wires of the relay should go to
yellow- power
blue- ground
black- relay ground
white- signal/ignition

If anyone can help me clarify how to hook the fans and relay up correctly it would be GREATLY appreciated. Thanks.

http://imgur.com/9AQclbM
http://imgur.com/cAUu7Te
http://imgur.com/5F0bm0a
http://imgur.com/BtCbVJh
http://imgur.com/RrlXtK9
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Old 05-07-2017, 08:00 AM   #2
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Re: Trying to wire in a relay for fans

What kind of coolant temp sensor are you using?
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Old 05-08-2017, 09:31 AM   #3
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I want to say it's a Bosch sensor but honestly I'm not 100% sure I replaced it years ago. What I do know is that this wasn't an issue when I had just one fan- it started when I added the second fan (which was needed) spliced into the same power/ground wires as the original fan. I'm just not sure how to wire both fans with a relay and have them automatically turn on when it hits temp.
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Old 05-11-2017, 10:19 PM   #4
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Re: Trying to wire in a relay for fans

Well, you could run a relay to the main circuit off of the alternator and activate it from the other fans 12v.
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