1997 bmw e39 aftermatket speaker amp

[120alexis]

I got a e39 with aftermarket amp when i push the window switches the speakers fade like if it loses power i have checked grounds and power wire and have not found the cause of the problem. It only dose this when the car is on if it is on accsesory mode it dosent do it. Any suggestions. I hace two amps one for bass and the other for door speakers they are both connected to battery and im using oem speaker wire. any suggestions?

[Pelican Parts]

Hello - take a look at the link below to an earlier thread where an e39 wiring diagram is linked. I would check to make sure everything is correctly sorted. I've never come across the situation that you're describing; in regards to the window switched effecting the stereo.

https://www.bimmerforums.com/forum/s...arness-Diagram

[120alexis]

Evrything looks the same as how i connected. I am still using oem speaker cables and oem speaker.