Nothing coming from 12Volt line going into the stereo on 2001 Grand Marquis
I removed the factory stereo, and matched the pigtail of the aftermarket Dual
stereo, color for color. Didn't work. I went back and checked the wires with a
voltmeter and am getting the required voltage on all of them EXCEPT the
battery constant, which reads 0. I checked the fuses, and all other
electricals are working as far as I can tell. The factory stereo was operating
just fine up until I performed this install, so I am at somewhat of a loss as to
what to do. Any guidance on how to further trouble shoot this?