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fan switch cj7 jeep

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=131715
Printed Date: May 14, 2025 at 10:48 PM


Topic: fan switch cj7 jeep

Posted By: ariff
Subject: fan switch cj7 jeep
Date Posted: June 29, 2012 at 10:21 AM

Hello I am hoping you might be able to help me complete my project. I have an old Jeep CJ7 I have installed an electric radiator fan controlled by a thermal switch. I also wired in a 3 way ON\OFF\ON SPDT switch so I can choose to have the fan controlled by the thermal switch, turn them off, or turn them on all the time. I wanted the ability to turn them off when having to do water crossings and what not. However I also want to have an indicator light light up when it is in the off position so I remember to turn the fans back on again. Seems simple enough however I can't seem to make it work. I know it is possible I just can't put my finger on it. Here is a schematic of how I have everything connected now. Thanks for any tips.
https://imageshack.us/f/3/contourcoolingmodifiedw.png/



Replies:

Posted By: lurch228
Date Posted: November 04, 2012 at 2:52 AM
Assuming that the switch is positive in both on positions. Connect to both positive on legs and diode isolate each to 86 on relay, 85 to ground, Ignition input from switch 12v to 87a, 30 to (+)light side, (-)light to ground. When relay coil recieves 12v from either on side of switch it opens 87a, and closes 87, When no voltage 87a passes 12v to light.





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