You might check your grounds, the battery cable ground, the engine to cab ground, and the cab to frame ground. Bad grounds will do some crazy stuff, mine used to flicker the lights and shut the radio off everytime I hit a bump.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed
Chad
South Central Nebraska
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