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Old 4th March 2013, 09:51 PM   #1
diyAudio Member
Join Date: Mar 2013
Default I think I might have toasted my amp...

I have a 2004 Wrangler with a Pioneer DEH-X7500S head unit, Polk MM651 speakers, and a Rockford Fosgate Punch 210s amp. I had to do some welding on the Jeep yesterday (with a crappy ground too boot) and I forgot to disconnect the battery or unplug the audio.

When I started it after welding on it there was extremely bad alternator whine coming through the rear speakers. I turned the volume off and it did not change. Unplugged the amp and it went away. Plugged the amp in and disconnected the RCA cables and it went away. It does not happen with the engine off with the key on accessory. The front speakers are just some Polk 4x6's driven from the head unit and they still work fine. So it looks to me like something on the input circuits in my amp got fried.

Everything worked fine before I welded on the Jeep.

Would a ground loop isolator help out at all, or did I just send an old friend to it's grave?
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Old 4th March 2013, 09:59 PM   #2
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
Check your RCA shields:
RCA Shield Repair
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Old 4th March 2013, 10:03 PM   #3
diyAudio Member
Join Date: Mar 2013
Thanks, I'll check that as soon as my wife gets home. For some reason I thought it would be a good idea to leave my fluke meter in her car.
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Old 4th March 2013, 10:54 PM   #4
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Join Date: Mar 2013
I checked the head unit and the amp. Head unit is fine, amp has 977 ohms on both inputs. That page only talked about head unit outputs but I'm guessing the same theory holds true for amp inputs. I have a very basic general knowledge of DC circuits but I've never had to do any real work on them. As a mechanic it was always check for power, ground, and communication then replace the bad part (whole assembly) or wire. I'm open to any and all suggestions as to where to go from here to repair my amp.
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Old 4th March 2013, 10:59 PM   #5
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nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
Either you have damaged an interference suppressor on your vehicle or some damage has been done to filter components in the amplifier.
The alternator will only interfere with the amp when the engine is running.
Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk
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