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Old 08-09-2009, 01:45 PM   #1
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another DIY jeep project and Im stuck (audio related)...

One day maybe I will learn to let people who understand this stuff do it for me and just fork out the money. Until then, I will continue posting questions here where you all have been very helpful in the past.

Ok so here we go. Im in the process of replacing my head unit, adding an amp and 6x9speakers. It all seems straighforward enough.....Except that I cant get the new head unit to acknowledge that it is getting power. I turn on accessory and everything else comes on fine. I have tested and verified that there is power running through the red and yellow wires (using a voltmeter) to the unit. Still nothing. In trying to figure this out (Im about to return the head unit and see if by some chance I got a bad one) I am a little confused about the grounding for the head unit. All the wiring diagrams state that the black wire in the harness is the ground. Fine, no problem. Except that it just loops to another hole in the harness and then seems to end (see 1st img). Second, there is a large metal ring that Im assuming is the actual ground (2nd img). Any help/ideas/obvious troubleshooting that I missed would be much appreciated. I have also checked the fuse on the head unit, its fine.



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Old 08-09-2009, 01:51 PM   #2
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make sure your fuse is good under the hood and or behind the glove box. remember it sounds dumb but you have to manually turn the head unit on the first time by hitting source or power button. it wont just turn on.

if thats not it check power to the hot wire. if thats not it you may have a bad head unit.

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Old 08-09-2009, 01:53 PM   #3
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in the first pic there is a crimped black wire by your lower right finger. where does that go?
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Old 08-09-2009, 02:05 PM   #4
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that is the ground wire from the head unit's harness to the jeep's harness. That was one of my questions. It goes into the jeeps wiring harness and then makes a 'U' and effectively dead ends (I think).

The fuse behind the glovebox is fine. Also have checked power to the head unit - yellow wire - and it was running a hair under 12v. Also checked the red wire - which should be the switch from ACC and it was registering power, though not as much.
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2000 Wrangler Sport, 4.0L auto
OME 2.5" Suspension Lift
1.25" JKS BL and 1" MML
33x12.5 GoodYear Wrangler Duratracs
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Old 08-09-2009, 07:09 PM   #5
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Did you test the ground with an ohm meter to the frame?
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Old 08-09-2009, 07:34 PM   #6
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run a test ground, just get some wire and attatch it to any metal behind the dash on the dash frame. if the unit turns on your good to go.
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Old 08-09-2009, 09:39 PM   #7
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ugh fuse #25. the fuse labeled radio was fine.....figures. oh well, problem solved.

"Lifes tough, but its tougher if you're stupid." <= story of my day. Nothing a margarita cant fix. Thanks for the ideas guys.
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2000 Wrangler Sport, 4.0L auto
OME 2.5" Suspension Lift
1.25" JKS BL and 1" MML
33x12.5 GoodYear Wrangler Duratracs
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Old 08-10-2009, 07:53 PM   #8
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i had a very similar problem and figured out that the actual grounding lug for my head unti was on the back of the stero. it should be like a cas bolt hole. hope this helps
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Old 08-10-2009, 09:33 PM   #9
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Quote:
i had a very similar problem and figured out that the actual grounding lug for my head unti was on the back of the stero. it should be like a cas bolt hole. hope this helps
That is the case in mine as well. Turns out the fuse was my problem all along. Maybe should have disconnected the battery in the first place like all the directions said to .

Anyway got it all rigged/finished up tonight. Had to go for a joyride and test it out - MUCH BETTER!! Pioneer head unit, Sony 600W 4 channel amp, and 4 Sony 6x9 speakers.

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2000 Wrangler Sport, 4.0L auto
OME 2.5" Suspension Lift
1.25" JKS BL and 1" MML
33x12.5 GoodYear Wrangler Duratracs
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