Stereo getting no power. -
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Go Back > General Technical Discussions > Stereos, CB & Ham Radios, GPS, & Electrical. > Stereo getting no power.

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Unread 04-11-2013, 03:43 PM   #1
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Join Date: Dec 2012
Location: mentor, ohio
Posts: 16
Stereo getting no power.

I'm trying to install a new pioneer head unit to replace my old stock one in my 1997 TJ. Today I went out to replace it after splicing the wires for the wiring harness and doing all the prep work, and found out the stereo still would not work. I was hoping that the reason my old stock stereo did not work was because of the head unit itself, but I was not so lucky. I was hoping you guys could help me out with a few questions that would help me troubleshoot.

The first question I have is why the head unit is not getting any power. My Jeep has a host of electrical problems (like having to punch the steering wheel for the turn signals and wipers to work). I changed the fuse and still no help. Any ideas on why this is?

Secondly, on the wiring harness that I purchased from Wal-mart has three adapter things. One large gray one, one smaller gray one, and one small black one. Most of the wires seem to come out of the large gray one, but it does not connect anywhere. The smaller gray and black ones both have connectors, does anyone have any idea why this would be or if it's even a problem?

Lastly, the black wire that comes out of the plug that goes into the back of the stock head unit goes connects somewhere else than where all the other wires go. It seems to go through the firewall behind the top left corner of the passenger air bag. Does anyone know why this is/where it goes to/ and if I have to connect anything in the same spot from the after market head unit?

Thanks a ton!

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Unread 04-11-2013, 10:31 PM   #2
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1997 ZJ 
Join Date: Feb 2013
Location: Youngstown, Ohio
Posts: 300
Not sure on the first one. Check the yellow and red wires where they connect to the new radio. Yellow should be constant positive, Red should only be positive with the key on.

The plug is made to fit many vehicles. Just plug in the ones that match your Jeep. My 97 Grand sounds the same as yours. I only used the 2 smaller plugs, gray and black.

I think you mean the black wire that has a female spade connector on it that was originally connected to the factory radios chassis? If so that's your ground wire. You need to splice it to the black wire on your new harness. The connector on the black wire should look almost like this:

If the ground is not hooked up that would be the first thing I would try. No ground=no power.
This may also help. Of the two grounds shown, only one should be used on your jeep.

Rust never sleeps...
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Unread 04-11-2013, 10:41 PM   #3
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Join Date: Dec 2012
Location: mentor, ohio
Posts: 16
I found out through another post that the ground was indeed not connected, but the black wire actually comes out of the plug that all the wires come out of (the one that attaches to the rear of the factory head unit). I have a longer black wire that i just connected to the matching black wire of the wiring harness, which i believe was a mistake. I found out i might have to connect this to the ground on the jeep, likely the easiest place would be where the current one is connected.
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