Do you have a sister truck to swap out the control card and see if the problem moves to the other truck? If you smell something getting hot (electrical smell), your in the right area. Pull out the control card and look inside at the circuit board, if there is any sign of being wet (calcium deposits)....then I would replace it. Your new card will come pre-loadedwith specific values, and you will need the LX handset for your specific truck setup
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