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franken · 06-10-2018, 04:31 PM

New harnesses need to be checked with a low current source of power to avoid this situation. Sounds like the new underdash harness is wired incorrectly. That's my best guess.
The horn button provides a ground to the horn relay, which powers the horn.

06-10-2018, 04:31 PM	#5
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,052	Re: Impala horn wire melted!!!! New harnesses need to be checked with a low current source of power to avoid this situation. Sounds like the new underdash harness is wired incorrectly. That's my best guess. The horn button provides a ground to the horn relay, which powers the horn.