Both signal lights flash when u put either on. Ground issues?

Herbert Bell

Asked by Nov 30, 2014 at 12:48 PM about the 2007 GMC Sierra 1500

Question type: Maintenance & Repair

2 Answers


grounds first, bulb sockets next, then switch.

1 out of 1 people think this is helpful.
Carl Franklin

Grounds first, sockets then switch? What does that mean?

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