No interior lights

[Hurricane240]

Your e30 has a dome light?! WTF!?! I want a dome light!

91 325i.. no dome light..

[North]

Originally Posted by E30M42cab

If you're talking about the dome lights, the switch on the door jamb is usually the culprit... shitty rusted ground or sticky switch.

This.

Also, sometimes when hacks add an aftermarket alarm to their car, they use the door jamb switch for a door sensor.

[everlast]

If the door switch is bad or bulb is bad you'd still have 12V at the light. The light should always have 12V, the switches provide a ground circuit. So, make sure you check the red/green wire at the light with KNOWN good ground in the car.

If you have 12V, then its a grounding problem. If you don't, then the switches, etc don't matter, its a problem on the + side of the circuit.

I don't know what the green wire is in the pic, but is that a bare wire exposed? Definitely fix if so.