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Thread: Dual temp sender
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04-01-2015 #8
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- Sep 2006
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For me in GM cars, like SBC,BBC use old school temp sensors for tpi. Msd and jet used make them in different temps. If you want fans at two different temps you should use the two different switches and relays. NEVER try to run fans direct from switches.
I use the oval gm relays as they work well under heavy loads.
And don't burn up easy.
Use the switches to run relays.
My personal preference is to run fans full speed, if you run two fans at two different temps I would use the high temp one for ac too.
There are several ways to wire this set up. One relay to run one fan one for another OR one for one fan and one for both fans.
Use 18 guage wire fused to relay. Ground through switches. Run 10 ga fused to fan relay then to fan.
Or 8ga fused from battery to relay then single trigger wire to relay.
Lee Abel
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