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Any update on this?
I identified the under-dash connector as BMW 1378134-01. I was able to find a duplicate on a French Amazon site, but no male version of the connector. I can find no other information on the connector.
I can confirm that the connector has +12V, GND and stoplight/brake pedal wires. I'm assuming the 4th wire goes to the trailer brakes.
Has anyone used this connector or cut it off and used the wires for their trailer brake controller?
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