I have a 1998 SK200 LC mark V 5.9 Cummings, serial no. YQU2938. Code 15 Charge is on in LCD screen, it has new batteries and alternator. When test voltage at idle at batteries it reads 27 volts. Is there a way to clear the codes? Will they go away if problem is corrected? Would 27 volts at idle be within specs.? thank for your help Mudober
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