Brown wires are ground in these cars. You could always run it to a chassis/trim screw or something too if you wanted to add a separate ground (usually a good idea).

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth