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post #1 of 10 (permalink) Old 09-21-2013, 11:19 AM Thread Starter
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installed amp, now feedback thru speakers

I just installed a small amp to give the sound a boost over the exhaust. Not a lot of money so I went for a cheap unique cycle 300w unit. I ran a direct line to the positive with 16 ga. solid copper. The ground is their wire to the frame. Started it up and constant interference. So I thought maybe the power was too small a gauge so I ran a pc of 12ga solid copper, but still the same noise. Did the same for the ground. No luck. Anything else I should be looking at?
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post #2 of 10 (permalink) Old 09-21-2013, 11:57 AM
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Verify that you have a good/solid ground connection..


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post #3 of 10 (permalink) Old 09-21-2013, 12:33 PM
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What does the interference sound like, is it only present with the bike on and engine running, does it change with the engine rpm?

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post #4 of 10 (permalink) Old 09-21-2013, 10:06 PM Thread Starter
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it's spark plug interference. It goes up and down with the throttle. You can hear the motor in a low buzzing. I have it grounded to one of the inner fairing mounting bolts, just below the hooks to hang the fairing.

Last edited by Quickster; 09-21-2013 at 10:10 PM.
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post #5 of 10 (permalink) Old 09-21-2013, 10:52 PM
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Run your ground back to the negative of the battery. Also be sure to use stranded copper wire, solid wire will break with the vibrations.
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post #6 of 10 (permalink) Old 09-21-2013, 11:12 PM Thread Starter
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I was thinking about running a ground back, but didn't know if totally isolating it was a good idea.
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post #7 of 10 (permalink) Old 09-21-2013, 11:54 PM
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Get a ground loop isolator it will fix ya right up. You can find them all over the net or stop in at a best buy that has a car audio department. There is also an old school trick see the video below.

http://youtu.be/dY3gD-j4SVs


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post #8 of 10 (permalink) Old 09-22-2013, 09:07 AM Thread Starter
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will give it a shot. I was so aggravated I said screw it and disconnected the ground and power, put the fairing back on so I could ride.
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post #9 of 10 (permalink) Old 09-27-2013, 07:45 AM
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Your isues is a ground loop. Following Rig Magician's advise will solve the issues. Also, I'd replace the 16 gauge solid "hot" wire with a 10 gau stranded. If the amp is truly pulling 300w you may have issues with the wire overheating and a potential fire hazard.

Good luck and good riding.

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post #10 of 10 (permalink) Old 09-27-2013, 08:16 AM
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Does it make a difference which one of the RCA cables is used?


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