Anyone know where a good source to tap into for electric fans under the hood to come on only when the ignition is on? I have my fans hooked up to the battery right now, through a controller so it doesn't kill my battery, but It does get annoying when the truck is off. Thanks!

 

Have mine hooked up the same way. I've had it that way for a year and a half with no probs. I've thought about finding a switched source but it doesn't bother me this way and I've seen factory systems run this way, so for now I will leave well enough alone. If you find a good switched source be sure to post it for future reference.

 

Radio. I used it for a project i did. Works fine for me.

 

I'm using the 4wd solenoid as a trigger.