vipervin

I have an Eclipse CD5423 HU with mini-jack AUX IN. I wired that straight to my headphone output on my laptop. However, I get an annoying alternator hum/noise in my music. I bought this from Crutchfield: http://www.crutchfield.com/S-JgyVrJf...er&i=127SNI135
but it barely made an improvement.

Regular music through a CD works fine, it is just through the AUX-IN plug. I am running an IBM ThinkPad X24 notebook connected to Carnetix P1900 DC-DC regulator.

Any suggestions?

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Eternalodyssey

Check your ground wire going to your head unit. Also, you might want to make sure your ground wires are of the correct gauge. If your H/U isn't grounded directly to the chasis of your vehicle, try grounding it straight to the body of your vehicle. grounding tips.

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vipervin

I used the grounding wire on the wiring harness, but I will try grounding to the same point as the P1900 (which is on the chasis).

blkwrx

http://www.mp3car.com/vbulletin/car-audio-faq/79248-induced-noise-ground-loop-trouble-shooting-guide.html

Shadow

Does it happen if you unplug the charger for the laptop?

vipervin

Then my laptop turns off because I took the battery out. Laptop is powered by the AC plug. But when the computer is off, there is no noise.

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