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  1. C

    Trailer lights

    We called the dealer yesterday and they have never heard of this before. If a fuse it would be one under the hood, not in the cab. Called a different mechanic, not the dealership yesterday also. He said it is common for program updates to mess up systems other than the stated update.
  2. C

    Trailer lights

    Just had DEF software update. Now my trailer lights including brake lights and turn signals do not work when the lights selector is set to AUTO. They work when set to manual selections. Anyone else have this? Any suggestions?
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