From digest.v7.n21 Wed Jul 30 07:04:31 1997
From: Kim Watters Halapin <zgbjtjh_at_snt.bellsouth.com>
Date: Tue, 29 Jul 97 15:51:31 EDT
Subject: Re: <E36><M3> Stereo upgrade self-install, ignition noise
I seem to remember a similar problem with with a '95 M3 a while back.
I shared my experiences with my E34 stereo upgrade with him, specifically
the problem getting rid of the alternator whine. While you are experiencing
ignition noise, both can feed back through a noisy ground. To the point,
the solution was to cut the ground wire at the head unit and splice in a
wire grounded to the bracket. Again this was to eliminate whine, not
ignition noise but you might want to give it a try.
Standard disclaimers apply.. not a stereo installer, not a mechanic, etc.
MBQuartz QM215.03CX's front, MBQuartz QM130.03CX's rear
JL Audio 8W6 subs, SoundStream Reference 705S amp
AudioControl EQQ, Kenwood PS905
> From: "Kirk Shafer" <kirk_shafer_at_smtpgate.tais.com>
> Date: Fri, 25 Jul 97 11:22:11 PST
> Subject: <E36><M3> Stereo upgrade self-install, ignition noise
> Has anyone performed their own stereo system upgrades on a late model
[ Help ]
> E36 and battled ignition noise?
> If yes, what solved noise problem? Wire routing alone, amp mounting
> isolation, shielded cabling, were 12VDC in-line filters?
> I removed stock amp. Replaced with a line-level converter (to get low
> level signals to work with), one 3-way electronic crossover unit, 3
> amps (parallel-connected some speaker pairs). Having much trouble
> eliminating a constant-volume ignition-correlated whine. Assuming
> ignition noise on 12VDC lines coupling into low-level preamp signal
> conductors somewhere. Driving me nuts, especially since I'm an EE and
> have done numerous stereo and feel like I should be able to fix this!!
> Thanks for any advice, professional or otherwise.
> Kirk S
> 97 M3