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Old 03-18-2014, 03:24 AM   #1
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Strange blower fan issue.

My brother owns a '02 TJ. The previous owner had ran a wire that was grounded from the frame to the resistor pack connector. it was placed in the open slot that connects with the resistor pack. This runs the fan at full power at all times. It doesn't matter switch position. The only time the fan shuts off is when the jeep is off. When I disconnect that 5th wire there is absolutely no power to the blower. I replaced the resistor pack for good measure and still nothing. I looked up a wiring diagram and all wires seem to be in proper order.

I am at a loss of what to do now? bad switch maybe?

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Old 03-18-2014, 04:27 AM   #2
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You had a ground and it worked (without speed control)
You removed the ground and now it doesn't work. I'd start by looking for the factory ground.

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Old 03-18-2014, 05:49 AM   #3
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My blower switch went bad to the point of melting the back of it and the plug in connector. Bought a new switch but couldn't find a connector at the time so I drilled the copper terminals on the new switch and hard soldered the wires to it.
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Old 03-18-2014, 09:37 AM   #4
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Is the brown/tan wire between the resistor pack and switch still in place? FWIW, power comes first to the motor through the relay, then through the resistor pack (except high speed avoids the resistor) then on to the speed switch, then jumps to the mode switch (through the dark green wire) then to ground. All the switches are on the ground side of the circuit, that is why jumping the motor (at the resistor pack) to ground makes it run at high speed.

With your jumper wire removed, pull the 5 wire connector off the switch and use a jumper wire to ground the brown/tan wire in the connector. If you get high speed by doing that, set the speed knob on high, and ground the dark green wire in the same connector. If you get the motor running on high there, replace the mode switch, if not replace the speed switch.
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