Just installed a new stereo, amp, and speakers in my '85 300D. Everything works fine except I am getting engine noise coming out of the rear speakers as soon as I turn the car on. The noise appears to be related to the auxillary fan. The aux fan comes on as soon as I turn the car to the pre-glow position. I have tried finding a different ground, I also have the power wire hooked directly to the battery. I have installed many stereos in my time, but have never encountered this problem. Any assistance would be greatly appreciated.

Mike

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Mike

'80 300D
'84 300D
'85 300D
'87 300D

Try a capacitor type noise filter like they sell at Radio Shack. Why does your aux fan run all the time?

Sixto
95 S420
87 300SDL

hmm
i think this problem is caused by the alternator
try a better point to ground your amp