ground location

[Ti Kan]

James Hanson writes:
> project for today: relaying headlights on my 4k.
> is there any reason not to ground my headlights (individually) through the
> ground on the original harness?

Yes, the principal purpose of using a relay harness is to bypass the
factory wiring.  If you ground through the original factory wiring you
defeat that purpose.  It's best to ground to the body somewhere in
the engine compartment, or directly to the battery negative terminal.

-Ti
2003 A4 1.8T multitronic
2001 S4 2.7T
1984 5000S turbo
1980 4000 2.0
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