deesandvees

I know the fan draws a lot of amps so what's a safe way to hook up a switch to turn the fan on and off as needed? I need to do this to bypass the computer because it's not turning the fan on like it should.

mpb74

you could run the negative wire from the fan to the battery, then you can run a power wire to one of your fuses in your fuse box so the fan works with your switch. the fan will run all of the time when the switch is on, so you may want to use this as last resort, but it will work.

online170

Dont do that. These fan's are not meant to run all the time. If they do, itll burn out the motor. You may also develop a "phantom drain" where the battery will die over night.

Take the two wires from the fan, a portable switch, and a fusible "inline" 30A link.

1) Positive battery to Fusible link
2) Fusible link to Positive Switch
3) Negative switch to Negative battery (OR) to ground.

MAKE SURE you run atleast a 12 gauge wire.
MAKE SURE you place the fuse so its not too close to the battery, or the exhaust manifolds, but still accessible. I put mine behind the headlights.
MAKE SURE you seal off all connections either with tape, or those heat shrink sleeves.

12 gauge wire is sufficient, but ive had it get hot enough that it melted the plastic on the fuse holder, and broke the connection. The fuse is still good, and the wires and fan are still good. SO i will replace the fuse, and upgrade to 10gauge.

naf

iTrader: (7)

Singe Fan? The computer only controls one of the fans in the dual fan setup. The other fan (and the fan in the single fan setup) is controlled through a fan relay and a temp switch in the head. If your's is not working fix it.

If your dual secondary fan is no longer controlled by the computer (maybe the computer's been removed) wire it up through it's relay like the primary fan. You can still use the same temp switch. They'll come on at the same time.

If you need to retrofit to an electric fan grab the pieces/parts from a JY and wire it up like stock.

Don't run your fan's primary power through a switch. The amp draw is too large for all but the more expensive switches and you'll pay for more larger guage wire. The correct relay can be had for little$.

oil pan 4

iTrader: (1)

I use 12ga wire and relays to handle all the power for the fans. It cuts down on the amount of 12ga wire you have to use.
Wire the the realy coil hot, that way you can ground it and every thing with 18 or 22 gauge wire through a small manual toggel switch and "Radiator fan switch"/thermostat switch.
I have a 20 amp fuse on my 16'' fan, I had a 15amp fuse but there was a little bit of voltage drop after it. It would have blown sooner or later. It drew about 20 when it turned on.
My 12'' fans will have 15 amp fuses and 14 ga wire going to them. They only draw 5.5 to 6.6 amps depending on system voltage.

mean57

65.00 works perfectly no guessing no questions.
http://store.summitracing.com/partde...5&autoview=sku

oil pan 4

iTrader: (1)

Get a fan switch like shown (not a sender), a relay and a manual switch. If you all ready have the wire it can be done for about $20. -$5 if you don't want a manual switch.