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Old 14th April 2009, 01:15 AM   #1
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Default alternator noise

i haven not searched but i want a direct answer. i just put in a diferent speaker amp in my truck today the only two things changed was the amp and location of ground wire. i now have ALOT of alternator whine. is it just ground location or amp? it was clean metal that i bolted to. any quick ways to check without removing the amp?
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Old 14th April 2009, 02:41 AM   #2
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It would really help us if we knew what kind of amp we were dealing with.

Also, do you have a Pioneer radio?
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Old 14th April 2009, 05:02 AM   #3
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i do have a pioneer radio im well aware of their issues. i also figured it out somehow my RCA's became twisted with my amps power wire. moved rca's to different locaation noise is 100% gone...guess their not shielded to well
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Old 15th April 2009, 03:09 PM   #4
Dan2 is offline Dan2  South Africa
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from the head unit side, solder a wire from the RCA shield to the head unit chassis.
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Old 15th April 2009, 11:09 PM   #5
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i fix mine like this its a much better and less ghetto fix

Click the image to open in full size.
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Old 16th April 2009, 03:18 AM   #6
ppia600 is offline ppia600  United States
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If you want even less "ghetto", install a mini blade fuse holder into the back of the deck's chassis betweed ground and the rca ground pin and use a low current (1 or 2ampere) fuse to protect your cables. That small circuit in the pioneers also protects the rca cables from melting in case of a voltage problem in the preamp section of the amplifier.
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Old 16th April 2009, 11:39 AM   #7
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I agree. A fuse is needed there. It burned because a power source came into contact with the RCA shield. It wasn't likely the remote output because the 3 amp fuse probably would have held. It's likely due to the main 12v B+ wire coming in contact with the shield.

Without the fuse in the head unit shield, this can cause the RCA cables to burn just like the main power cable would burn if it was improperly fused and made contact with the chassis ground. The RCA cables will burn the entire length of the cable until it reaches the melting point of copper. At that point, the carpet will likely be burning.

If you want something simple, a 1 ohm 1/4 watt resistor will work. It won't burn unless the shield is again shorted to a power source.
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Old 16th April 2009, 11:27 PM   #8
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that player was blown up upon recieving i have never blown up one of my persoanl ones
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Old 17th April 2009, 04:37 AM   #9
ppia600 is offline ppia600  United States
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Quote:
Originally posted by audiobahnkid592
that player was blown up upon recieving i have never blown up one of my persoanl ones

You don't have to touch 12v to an rca ground to fry it, the internal circuits in the amp can have issues and send high voltage through rca ground and fry it. Most of the time in cheaper amps but I've seen it happen with a few large alpine amps and fosgates.
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Old 18th April 2009, 02:13 AM   #10
jol50 is offline jol50  United States
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I just had an insignia do it to my old bench HU. Amp had a fried ground trace on the shields and popped the HU. Don't know what happened to the amp it came that way. But I hot-swapped that HU on lots of amps before that with no problem, had to put a ground wire in it now.
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