help needed with electric fan wiring

I replaced my clutch fan w dual electric fans. I had them wired to a toggle switch but I decided to get rid of my fog lights and run them of the switch for them so it looks cleaner. My ? Is which wire on a 99 cherokee is the power supply run out of the switch to the fog lights there is a blue purple black and orange. And can anyone tell me if the power in wire is strong enough to handle the fans

Don't try to run the fans directly off that switch. If anything, use that switch to control a relay.

Pin 1 Orange- Illum
Pin 2 Blue - to fog relay
Pin 3 Purple - Switched 12V source
Pin 4 Black - Ground

Remember, the factory fog light switch is only powered when either your headlights or parking lights are on and your high beams are off. This is controlled by the relay in the fog lamp circuit which is actually before the switch. The fog lamps are wired directly to the switch and typically cause premature failure of the switch due to overloading it. Running an electric fan off the fog light switch would just accelerate this problem.

If you really want to use your fog light switch, bypass all the factory wiring and use the fog light switch to control a relay which in turn will control your electric fan.

I would get a temp. control unit. Have converted to el- fans and the set included a control cercuit with a temp. sensor witch is stick into the ribbon at the radiator inlet. Works great Free adjustable by pot meter....and than your wireing is only to power supply and igniotion switch(not nescessery though)

Reccomended'

Link to my kit
http://cgi.ebay.com/ebaymotors/JEEP...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

This is the kit I used to wire up my aux fan and Flex a lite fan it came with a 40 amp relay, its a light wire kit but it was the same as a basic kit from flex a lite and half the price.
http://www.4wheelparts.com/prodDetail.aspx?partNo=EXP9400&jeep-parts=true

Maybe this will help.

I run twin thermo fans on mine and they run in a series / parallel arrangement to give a 2 speed setup, when the computer telle them to they change from series (low speed) to parallel (high speed).
I find that this works well although I will be fitting a switch to turn them off for water crossings as at the moment it will blow the fuse when traversing deep water...