Hey, I have a single fan setup. And I already have a manual fan switch, but my car runs a little hotter than it usually does in the summer, so one day I got my voltmeter and did some tests, and this is what I found. First, my setup. I just ran a wire from the positive on the battery, to a switch on my dash, and then ran it back the to positive on the fan. Well when I did my voltmeter tests I found that the voltage like right at the beggining of the wire that runs to the switch is about 11.4, then I took the voltage right at the positive on the fan, and got 10.2. So somewhere in the line I am losing 1.2 volts give or take. So I was wondering if the idea would be better, and if anyone has done it. I drew a picture: Give me your thought on if this setup would eventually burn up the solenoid and how effective it would be. Thanks guys,

P.S. Sorry this computer woudlnt do a .jpeg

 

You can't do it that way. The fans draw a lot of current on start up as well as when they run. Depending on what guage wire you used a voltage drop of a volt or so will be normal. Plus if the 12 volt feed comes off a switched source you will cook the ignition sw. Always ground the coil side of the fan relay as per instructions on this site. There are plenty of diagrams here on how to do it.

 

Ok, I might not understand you, or you might not understand my amatuer drawing. But how it works in words is like this:

I use a 12v ignition source, like the radio fuse underneath the dash, so I cant leave my fan on, and run down my battery, then that goes to my switch on the dash, so when I turn on my fan it will send a signal to the signal part of the mustang solenoid, and allow current to pass through to the fan. It is alot less wiring on the fan's part, so maybe I wouldnt get as much voltage drop, and my single bitch fan would run stronger. Hopefully I explained my drawing well. Are you saying that eventually I will fry that solenoid. That was the only concern I have for this drawing. Oh, and I left on thing out in the drawing. Put a 25 amp fuse somewhere in their.