About all I can help with is voltage and ground. The voltage is fuse protected, check the fuse and voltage on fuse circuit. If you think problem with ground, try a redundant ground. The text below is a little small, hope you can read it? bbbind.com should have your wiring diagram for radio. It's free.
SOURCE: 2004 Chevy Tahoe stereo wiring diagram
BLACK-ground
RED-accessorie
YELLOW-power 12v
PURPLE-left rear
GREEN-right rear
WHITE-left front
GREY-right front
BLUE-REMOTE
and the other blue one is for remote antenna..
SOURCE: wiring diagram
Battery LIGHT GREEN (+)
Accesory BROWN (+) RADIO HARNESS
Ground BLACK (-) RADIO HARNESS
Illumination DARK GREEN/WHITE (+) RADIO HARNESS
Dimmer DARK GREEN/BLACK (+) RADIO HARNESS
LF Speaker (+) GREEN/RED
LF Speaker (-) LIGHT GREEN/WHITE
RF Speaker (+) RED/BLUE
RF Speaker (-) LIGHT GREEN/BLACK
LR Speaker (+) YELLOW/WHITE
LR Speaker (-) YELLOW/BLUE
RR Speaker (+) GREEN
RR Speaker (-) GREEN/BLUE
SOURCE: i need a stereo wiring diagram for a 05/06 ford
Battery GREEN/BLACK (+) RADIO HARNESS
Accesory BLACK/PINK (+) RADIO HARNESS
Ground BLACK/GREEN (-) RADIO HARNESS
LF Speaker (+) ORANGE/GREEN
LF Speaker (-) BLUE/WHITE
RF Speaker (+) TAN/GREEN
RF Speaker (-) GREEN/ORANGE
LR Speaker (+) GRAY/BLUE
LR Speaker (-) BROWN/YELLOW
RR Speaker (+) BLACK/VIOLET
RR Speaker (-) ORANGE/VIOLET
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