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I replaced the cab on my 1996 f350 dually 4x4. The donor cab was off a 1993. I replaces all internal wires with the 96 harness. Truck starts and runs fine. Problem is the dash lights come on when the heater is turned on. The blower fan does not work. Windshield wipers don't work. I have checked all the plugs etc. can't figure it out. The motors to the fan and wiper are good. every once and a while I can get the motors to barely move but usually nothing. I am stumped. any ideas? Thanks
 

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You left off some grounds. Click this, study it, & read the caption:



The ground bolts are usually a distinct metallic green.
 
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