No, changing the fuse will do nothing. If it's a plug and play kit, then the ballasts are getting their power and ground from the original headlight wires.

Noise is always a pain in the butt to track down and eliminate. Believe me, I spent many years installing car audio equipment, and it was usually alternator noise that I was chasing.

Under these circumstances, I would guess that this noise is getting into the amplifier via the power and/or ground path. Your plug and play kit uses the same power and ground as the factory lights, so this suggests that the ballasts are very noisy and are introducing an A/C offset to the power line.

You can eliminate that by running a new power wire directly to the battery. However, if you do this, then the lights will be on all the time. So you would need to add a relay to the line, triggered by the headlight wire to allow them to turn on and off with the light switch. This would reduce the A/C offset that's making its way to the other electronics. Unfortunately however, if you did this you would trip a 'bad bulb' error from the LCM because the relay would be recognized as a blown bulb. You can then fabricate a circuit that would correct the load, but that's a pain in the neck and I wouldn't do so unless you know this is going to solve your problem.

Test 1: Use a temporary jumper wire to provide power to the lights from the positive battery post. Then while they are on, listen to the radio. Is the noise gone? If so, then the theory I shared in the last two paragraphs has been proved correct and then we can talk more about that relay/correction circuit. If the noise is still there, then it's likely coming in from a ground loop.

Test 2: Use a temporary jumper wire to provide Ground to the lights from the battery negative post. This will eliminate any possible ground loops. Test the stereo with the lights on. Is the noise gone? If not, then the noise is being electromagnetically transmitted and will be very hard to eliminate. You would need to shield the ballasts with a magnetically inert material.

If this is all above your head, I would take the car to a qualified electrical specialist and suggest these tests.

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Gator Bite
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