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I have a gmc sierra 3500 6.5 turbo diesel and the only head lights i have are brights. I changed the dimmer switch and still the same results. the switch is new.
Re: I have a gmc sierra 3500 6.5 turbo diesel and the...
The high beam turn signal cruise control switch in the steering column will do exactly this. we just replaced ours in our tahoe. we had only high beams also.
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Yes, the system is called Passlock, and malfunctions regularly. Go to this link for an explanation of how it works, plus some tricks and tips on how to reset it, or bypass it.
I own the same 3500 GMC 6.5 diesel truck with the same problem. We replaced the brain under the upper turbo hood and it fixed it pronto. No more shutoffs
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