Where Is The Horn Relay On 07 Nbs Sierra?

By cpowell74
March 3, 2009 in Ask A GM Technician

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cpowell74

Posted March 3, 2009

I want to add an air horn and could not find documentation for a relay (if any) that controls the stock horns to tap off of. If I need to I can tap off of the ground for existing horns to drive my airhorn relay, just a pain in the arse to trace wires since I can barely see the horns. It's an 07 NBS Sierra VMax SLT Crew Cab. Thanks to any responders.

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