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We have this issue on our fleet trucks there is a break in the purple wire on alternator take and run a jumper to battery box on pass side, this will prevent you from replacing whole harness. Typical symptoms are overcharging which makes bcm shut down to protect itself and just a nagging battery light even though its charging when you check batteries
Also take a set of jumper cables and go from battery to battery if this removes the light the wiring harness between batteries has loosened at a splice
 

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