Hello X men,
Redoing my 4 door speakers on the Blue Bomber.

I got ahead of myself and now I can’t find which door wire is + or -.
I haven’t cut any wires. Which one is the positive and negative?

I’m trying to continue to use the factory harness..

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2003 4.6is X5
2003 525it
2003 E53 X5 Standard shift