2000 Ford Taurus defrost issues

[woofercooker 10+ year member]

I popped an aftermarket head unit in the wifes car a couple of weeks ago. Now with the weather getting colder we noticed that the rear defroster does not turn on. I checked all of the harnesses and tested all of the wires and everything seems to be where it should be. A buddy of mine seems to remember something about putting an ignition wire to one of the wires in the defrost harness. Anyone out there that can help me out?

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[blgaudio 10+ year member]

Is it possible that when youns were checking for a 12v pos lead you touched it to the defrost harness and accidentally popped a fuse? I know there is a few fuses for the defrost but I cant remember if they are located under the dash or in the engine compartment.

 

[Louisiana_CRX 5,000+ posts]

those switches on the aftermarket kits are very cheap made