HU not powering after install

[TheBlackSheep 10+ year member]

I'm wrapping up an install job on a 95 Jimmy, putting in a Sony CDX-M8815 or something (not the one with the single control in the middle, but two on the sides with the display in the middle, which could very well be irrelavant), just put the dash back together and the HU isn't powering on.

Prior to putting the dash back on, the HU powered on and worked, at which point we continued with the job.

The fuse on the back on the HU is still good, and all the wires have solid connections (wire nuts). Since the dash is back on, it'll be a job to get to the wires and check them all out.

There IS one wire in question: a wire coming from the HU that doesn't have a mate coming from the harness; it's a remote ground. So do I tape it off, or wire it to the ground wire, or to a ground on the car, or what?

And if that's not the problem, any suggestions?

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[TheBlackSheep 10+ year member]

After looking a a wiring schematic, I've found that the wire in question was an amplifier remote; I've terminated the connection using a wire nut, but there's still no power to the HU.

Any suggestions?

 

[azbass 5,000+ posts]

you probably used the illumanation wire as the ground, because it acts as a ground. in GMC double check your wireing, also make shure you HAVE 12 volt switched, GMC cars i worked on, seem to lose the switched (red wire) power after time.

 

[Subz 10+ year member]

Get a current tester and check your two hot wires in your vehicle's harness (ACC and battery). If both of those are getting power, double check your HU's ground wire is grounded to something non painted such as a bolt connecting your dash to the body/frame. It could be something as simple as that. Or, it could be that something is wrong with the harness connectors. If nothing else you may end up having to cut out the vehicle harness connector (REMEMBER WHERE EVERYTHING GOES TO... it'd be a good idea to mark and label), and crimp all connections.