BMW E30 Electrical Technical Articles

The battery in the electrical system stores electrical energy for use when car is not running and also to start the engine. While the car is running belt driven alternator converts some of the mechanical energy into electrical in order to provide power supply to various electrical components. BMW e30 works on 12V system and is based on negative, or ground scheme.
Most, although not all, of electrical troubles are due to bad or corroded grounds, and aged and chamfered electrical wires.

SI Batteries Replacement

On BMW e30 bad SI board batteries will make tach and economy gauge not work properly. This DIY procedure illustrates how to change SI batteries.

Making Sidemarkers Blink

BMW E30 This is the wiring procedure to make your sidemarkers blink. When your parking lights are off, the sidemarkers will blink at the same time as the turn signal. When your lights are on, it will make your sidemarkers blink alternately with your turn signals.

Windshield Wiper Motor Replacement

This is a step by step procedure for replacing the wiper motor for an e30 Bmw 1984-1991.

Coolant Level Sensor Bypass

BMW e30 - how to bypass the coolant sensor temporarily until the proper replacement sensor arrives. Replace the sensor as soon as possible for safety reasons, but I do not like to see any warning lights on if the system is functioning properly.

Fog Lights Without Low Beams

BMW E30 fog lights modification procedure - use the fog lights without low-beams being on.

BMW e30 Keyless Door Entry

BMW e30 DIY keyless door entry - This modification will make it more convenient to get in and out of your E30. It is also safer to be able to unlock your vehicle when it is dark by simply pressing a button.

Non Functioning Turn Signal

BMW E30 This is a step by step DIY repair if your turn signals work on the outside, but do not blink on the instrument cluster panel.

Power Mirror Switch Repair

BMW E30 DIY electrical power mirror switch repair procdeure.