Getting rid of Alternator Whine

TXSpeedDemon · 04-30-2010, 10:58 AM

Thanks a lot for the feedback guys, much appreciated.

The noise is coming through the speakers, and changes pitch as I press the gas pedal.

All the wiring is from this kit: Rockford Fosgate RFK4D 4-gauge dual amplifier complete wiring kit at Crutchfield.com
I assumed the RCAs would be sufficient, but if these aren't good ones I'm open to recommendations.

I do think it's a grounding issue. I had stupidly covered all my grounding points with my sound deadening material and only had 2 bolts in view (directly behind center column in back small space of trunk) so have everything running to that single point. 3 8-gauge grounding cables running into a distributor and a 4-gauge cable running out and to the grounding point. I also left the 4 gauge full length in case I messed it up and had to rerun it someplace else - so it's about 3 ft long!!!!

Tonight I'll pull out the box and remove some of the sound deadening materials to expose a closer grounding point and cut all the wires to exact lengths (without using the 3-1 distributor) and see if that helps.

Headunit is an Eclipse AVN6620 with bluetooth, gps, rear camera and ipod adapters. The bluetooth is the only one placed behind the headunit, the rest are all mounted under the pass seat.

Thanks again for the tips guys, I'm DYING to get the car back on the road. It's been sitting in the garage for 7 weeks while I painted my wheels and stripped the interior for the sound deadening install. Hopefully I'll be cruising again by tomorrow afternoon

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04-30-2010, 10:58 AM	#1 (permalink)
TXSpeedDemon Enthusiast Member Join Date: Jul 2009 Location: Texas Posts: 330 Drives: 370Z, MSP, R8, 335 Rep Power: 3372	Thanks a lot for the feedback guys, much appreciated. The noise is coming through the speakers, and changes pitch as I press the gas pedal. All the wiring is from this kit: Rockford Fosgate RFK4D 4-gauge dual amplifier complete wiring kit at Crutchfield.com I assumed the RCAs would be sufficient, but if these aren't good ones I'm open to recommendations. I do think it's a grounding issue. I had stupidly covered all my grounding points with my sound deadening material and only had 2 bolts in view (directly behind center column in back small space of trunk) so have everything running to that single point. 3 8-gauge grounding cables running into a distributor and a 4-gauge cable running out and to the grounding point. I also left the 4 gauge full length in case I messed it up and had to rerun it someplace else - so it's about 3 ft long!!!! Tonight I'll pull out the box and remove some of the sound deadening materials to expose a closer grounding point and cut all the wires to exact lengths (without using the 3-1 distributor) and see if that helps. Headunit is an Eclipse AVN6620 with bluetooth, gps, rear camera and ipod adapters. The bluetooth is the only one placed behind the headunit, the rest are all mounted under the pass seat. Thanks again for the tips guys, I'm DYING to get the car back on the road. It's been sitting in the garage for 7 weeks while I painted my wheels and stripped the interior for the sound deadening install. Hopefully I'll be cruising again by tomorrow afternoon