11-13-2012, 08:12 AM
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Officially Welcomed to the 'Fest
Location: Atlanta
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Join Date: Sep 2012
Posts: 329
Mein Auto: 2010 335i Cabrio
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Quote:
Originally Posted by Diesel_D
Do I need to get a relay or switch? Or what would be the easiest way to sync them with my headlights?
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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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