Electrical issues

Post Mon Feb 15, 2016 9:32 pm

I have a 1987 325is and I was working on my radio as well as installing an aftermarket tachometer. I disconnected my battery and whe. I connected it back up. My horn, bright lights, and all AC/heater doesn't work anymore. I was curious if there's a common ground or something that connects all of it together I'm still working on the wiring for my radio so I'm not sure if it's working at the moment. All and any help is much appreciated.

Post Mon Feb 15, 2016 9:53 pm

Check the wiring diagrams here:

http://www.e30zone.net/e30zonewiki/inde ... g_Diagrams

Horn and lights are on one loom and the Ac/heater on another... horn has its own relay as do the lights and the ac/heater...

Post Mon Feb 15, 2016 11:32 pm

Where's your battery?

Post Tue Feb 16, 2016 12:30 am

My battery is in the trunk of my car.

Post Thu Feb 18, 2016 5:18 am

I replaced my fuel filter today and normally my car idles around 900-950 and little to no hesitation. After the filter change I noticed that it still idled around normal but smoother idle. It also hesitates to return to idle. For example, I can drive or rev my engine and when I let off on the gas it's drops to about 1300rpms then bounces to 1500rpms and then slowly drops back down to regular idle. What could be causing this? The fuel filter was in need of a change as it was heavy and produced grey/black liquid that came out of the inlet port when I changed it.