RCB

Ran a fan jumper through the fuse block, off of an ignition slot. However, it must share the instrument fuse. Throwing the switch a few times will blow the 7.5a fuse. I moved up to a 10a fuse, which holds it just fine. I don't see a problem with this, as any short will still move the current high enough to blow the 10a fuse, while the fan is running. Has anyone else done this, or had a problem with it? Or is there another way?

I just rather have the fan shut down if the ignition is off, to avoid any dead battery mishaps

mike37

use a relay that will solve your problem
a bigger fuse may damage your system

mobilecherokee4

just 5 minutes ago i unplugged my electric fan and wired it up so that i control it with a switch inside my jeep, its pretty cool

RCB

How many amps does your relay pull or is it negligible?

98 JeepJeep

if you wire a fan on a fuse or toggle switch your on borrowed time..............most elec fan have a high amp spike on start up....which will could melt your wiring....you need to do research on how many max amps the fan you wired up uses and get the right relay. Melted wire harneses arnt fun.......ask me how i know!

mobilecherokee4

trust me i found that out too when i used 14 gauge wire on the first try, they all just melted, so i moved up to 12 guage wire and it works fine, i ran it around for a while and the wires didnt heat up or anything but ill be keeping an eye on it for a while just to be safe

farmfuel

Ditto- just drop 35 dollars on a thermostatically controled fan relay/switch from Hayden (at Oreilly's or Autozone) Very simple to wire in- +constant, +key on, and ground is all you need. VERY small amp draw.

Any other way, and you're just rigging it. If you understand how a relay works, then you should apprecieate its function.

mike37

the relay runs off the battery with a 20 amp fuse but to activate the relay
.5 amp maybe

mike37

this is a great sight for electrical info

click on the relay controls under the diagrams and it shows you how it works

http://bcae1.com/relays.htm

98 JeepJeep

the main purpose is the Constant hott is taken from the battery and all you need is a little switched 12v source...which has no draw once the relay opens............

RCB

Oh yeah, well familiar with relays, just trying to avoid adding one more box in under the hood. I went ahead and installed one however. I have been considering replacing the aux fan with a higher performance model anyhow, so figured I might as well put the relay in anyhow. Not sure if will go so far as to replace the clutch fan however. I have had very poor luck with completely electrical cooling fan systems in the past.