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Old 10-28-2012, 07:27 PM   #1
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Need Audio Help!!

I have no sound coming from my head unit! Here's what's going on: The PO had an external amp with subs and speakers in the Jeep (97). He kept the the speakers and left only the amp under the back seat. There is an aftermarket head unit, pioneer deh-p3900mp. I don't want any fancy sound system so I took out the wiring and the amp. I hooked the head unit right up to the stock speakers and sound bar. The head unit comes on, functions, but there is no sound. Frustrated, I rewired from the head unit, through the external amp, back to the stock speakers and got great sound, except for a whining feedback as well. The whining was worse than no sound at all. I've gotten new harnesses and those made no difference. I know the speakers all work fine. The head unit works fine and produces sound. Why won't it send sound directly to the speakers using the simple wiring harness?

I hope you guys have answers!

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Old 10-28-2012, 07:39 PM   #2
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Sounds like your wires are not run directly to your speakers. Did the PO run new wires to each of your speakers from the amplifier?

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Old 10-28-2012, 07:55 PM   #3
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I don't think so, the wires ran from the external amp back to the original harness that plugs into the back of the stock head unit.
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Old 10-28-2012, 07:59 PM   #4
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Maybe the internal amp on that radio is shot. That whining sound you hear with the amp hooked up is called alternator whine. It usually occurs when the power and audio cables are run too close together. What kind of wires are you running from the radio to the amp? RCA cables or regular speaker wires?
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Old 10-28-2012, 08:18 PM   #5
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Radio to the amp had RCA Monster cables. Then regular speaker wires back to the dash. All that wiring is removed now. The thought of the internal amp being fried crossed my mind but I was hoping not to admit that..



On that note, who has a stock cd player they want to get rid of??

Does anyone know if stock radios from Jeeps also fit Dodge and Chrysler from the same era? I may have to go out and find a used one.
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Old 10-28-2012, 08:30 PM   #6
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use that amp it will have much better sound quality. Just run the power wire down one side of the Jeep and the audio down another side.

One thing you need to try before calling it dead. Unhook all of your speakers so that there arent any speaker wires hooked up to your radio. Then pull a speaker and hook it directly up to that radio and check to see if it works. If no sound then its done, if there is sound then you have a ground issue. Meaning that one of your speaker wires is touching metal somewhere. that could also be causing that whine. It could be that (most likely) your speaker wire is touching the metal basket on your speaker or that (less likely) somewhere there is a screw run through it. Hopefully this helps fix the issues, if not then yes, the wire harnesses should be the same for all chrysler models in that era. also check your local craigs list for radios.
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Old 10-29-2012, 12:20 AM   #7
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Maybe I can mount the amp under the drivers seat or something. I don't want it in the back because I don't have the seat back there a lot of the time and the top is off all summer.

I'll check the speakers tomorrow. Thanks for the help!
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Old 10-29-2012, 12:24 AM   #8
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Sounds like your getting alternator whine try running a ground loop idolater that may help with your problem.
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Old 10-29-2012, 10:24 AM   #9
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If they ran the wiring up to the radio from the amp, and you removed the wiring, did you repair the connections they made into the harness? If they ran each speaker wire up to the deck, they probably cut the wires so they no longer connect to the factory harness. Instead of feeding the speaker's the radio's amplified output, they were cut and reconnected to the amplifier's output. When you cut the amp's wiring out, did you re-connect the wires to the radio's harness?

Here are the stock speaker wire colors just in case it helps; just make sure all these wires are running from the radio to the speakers without any cuts.
1997 Jeep Wrangler
Front Left (+) - Brown/Red
(-) - Green
Front Right (+) - Blue
(-) - Purple
Rear Left (+) - Brown/Yellow
(-) - Brown/Blue
Rear Right (+) - Blue/White
(-) - Blue/Red
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Old 12-12-2012, 07:11 PM   #10
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i have a 2000 tj and my wire colors seem to match the 03-04 on this.this color chart differs from what is listed in previous post was wondering what is right ? just got a set of 5.25 sony explodes and adapter brackets and want to install them correct . thanks
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Old 12-12-2012, 07:27 PM   #11
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2000 Jeep Wrangler Stereo Wiring Information
I use www.the12volt.com for everything. up there is the link directly to your 2000 wrangler.
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Old 12-12-2012, 08:56 PM   #12
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thanks for the link . if i already wired this ass backwards i guess i should rewire it ?
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Old 12-12-2012, 09:08 PM   #13
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It would get you better sound so, yes, I would.
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Old 12-14-2012, 02:20 AM   #14
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Quote:
Originally Posted by aflemke
I have no sound coming from my head unit! Here's what's going on: The PO had an external amp with subs and speakers in the Jeep (97). He kept the the speakers and left only the amp under the back seat. There is an aftermarket head unit, pioneer deh-p3900mp. I don't want any fancy sound system so I took out the wiring and the amp. I hooked the head unit right up to the stock speakers and sound bar. The head unit comes on, functions, but there is no sound. Frustrated, I rewired from the head unit, through the external amp, back to the stock speakers and got great sound, except for a whining feedback as well. The whining was worse than no sound at all. I've gotten new harnesses and those made no difference. I know the speakers all work fine. The head unit works fine and produces sound. Why won't it send sound directly to the speakers using the simple wiring harness?

I hope you guys have answers!
Hey my CD player keeps giving me error message any tips ?
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Old 12-14-2012, 07:11 AM   #15
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Originally Posted by Eagleeay View Post
Hey my CD player keeps giving me error message any tips ?
Error when playing CD's only? Can you hear radio stations?
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Old 12-16-2012, 01:10 AM   #16
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Originally Posted by LilYeller

Error when playing CD's only? Can you hear radio stations?
Yeah I can only play original CDs and radio
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Old 12-16-2012, 01:45 AM   #17
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Quote:
Originally Posted by Eagleeay

Yeah I can only play original CDs and radio
Jeep factory head units suck. Mine was only able to play original cd's too. Swapped mine out and never looked back.
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Old 12-16-2012, 09:08 AM   #18
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Yea the problem is with the CD's then. most factory CD players wont play recorded CD's or MP3's. I would grab a new head unit that plays MP3's and you will be good to go. Even the cheapest aftermarket headunits will play recorded CD's

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