need help with new fans! HELP
Thread Starter
Safety Car
Joined: Nov 2007
Posts: 3,570
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From: bottom of the sea
need help with new fans! HELP
i just installed a new dewitts rad and fan. i triple checked my wiring and the fans wont come on. i pulled the relays apart and i have 12 volts coming in and i have 12 volts coming in on the switch side. they will not come on. they WILL come on if i jump the power side to the fan side, in the relay. its got to be the temp unit in the rad, right? yes it got hot enough. i stopped at 220
Drifting
Joined: Apr 2008
Posts: 1,305
Likes: 2
From: Lewisburg WV
thegazman
Sounds like the relay is not grounding to complete the circuit. I'm not sure how Dewitt's temperature sensors are installed. Try running a jumper from the relay ground terminal and grounding it to a know ground to see if the fans come on. If they do, you will know that the temperature sensor is not completing the circuit to ground.
Ken
Ken
Former Vendor
Joined: Jan 2000
Posts: 5,593
Likes: 631
From: Brighton
If the temp switch is in the radiator, you must ground the radiator before the switch will work. If this is the problem, you could also just remove the temp switch wire, touch it directly to ground. If the fans come on, then it's the missing ground or a dead switch.
Drifting
Joined: Apr 2008
Posts: 1,305
Likes: 2
From: Lewisburg WV
thegazman
There you go...the man himself would know. I have a DeWitt's radiator in my 1979 C3. The best install I ever made. It's well made and looks good. When my temperature gets to 180 degrees it stops right there. Thanks for making such a good product Tom.
Ken
Ken
Racer
Joined: Feb 2007
Posts: 307
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From: liberty mo
The man knows his stuff,same problem i had a couple months ago,ran a ground wire to the rad and all is well now 
Thread Starter
Safety Car
Joined: Nov 2007
Posts: 3,570
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From: bottom of the sea
