vt951

I just installed a very nice Alpine head unit in my '86 951, and electrical noise is coming through the speakers, but only when I have the radio on, not when playing a CD. I disconnected the antenna power line, and (oddly enough) I seem to be getting the same reception, and still get the electrical noise. The noise is sort of like clicking, and it IS related to engine speed.

Would this be a ground issue? If so, why wouldn't it happen when playing a CD?

Could it be a power issue? Right now, my 12 V constant is hooked up to the harness (with the Alpine inline fuse block). Pehaps I should try hooking it straight to the battery... would that make a difference with respect to noise?

Please help, so I can get this thing back together and take a drive today (it's beautiful out). Thanks!

vt951

Ok, I tried hooking up the power directly to the battery, and I'm still getting the noise. Also tried using one of the other brown wires for ground, and that didn't help either.

vt951

Anyone ever had this problem? Could it be that my engine is creating more electrical noise than normal? Maybe I should just put it back together and stick to CD's.

Luis de Prat

Yes, it sounds like a grounding issue. Are you sure you followed the wiring diagrams correctly? At any rate, the wires are very bunched together back there. Perhaps there's some interference going on? When I do mine, I try to wrap the wires in bunches with electrical tape. If anything, pull the thing out and try again.