Question about GMC Sierra 2500HD

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When I hook up my trailer all the break lights,signal lights stop

When I hook yp my trailer the stop lights signal lights,work but when I turn on the head lights no running lights or tail lights all others work.
I have a 04 GMC Sierra HD. Duramax.

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Sounds like the adpater to the hook-up is bad. or your grounds arent completely grounded. thats where i would start before rewiring the trailer.

Posted on Nov 19, 2009

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