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Old 11-13-2012, 08:12 AM
gpburdell gpburdell is offline
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Location: Atlanta
Join Date: Sep 2012
Posts: 404
Mein Auto: 2010 335i Cabrio
Originally Posted by Diesel_D View Post
Do I need to get a relay or switch? Or what would be the easiest way to sync them with my headlights?
I haven't done any electrical work yet on my BMW but will speak from years of experience with various other vehicles.

What you need is to first find a wire or connector that is switched coincident with the headlights; i.e. it's on when the headlights are on, off when the headlights are off. Best to get a wiring diagram of your car and look on the diagram in the vicinty of the headlights.

Once you've identified a switched source, you can tap into that to trigger a relay which powers the LEDs. Actual power could be tapped from the fuse block or battery connection (and fused!) and run to the relay.
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