Skid Steer Overcharging: Voltage High, Bulbs Burning Out
Fault Codes & Symptoms
High system voltage / Overcharging Related symptoms: - Premature battery failure (boiling electrolyte). - Damage to other electronic modules. - Erratic gauge readings. Operator reports that the work lights and dash lights are burning out frequently. The machine seems to run fine otherwise.
Confirmed cause: Defective internal voltage regulator. Repair performed: Replaced the alternator assembly. Verification: With the new alternator installed, started the engine and ran it at high idle. Measured charging voltage at the battery, which now held steady at a correct voltage. All lights and accessories operated normally. Technician notes: - This fault is a good reminder that not all alternator failures result in undercharging. Overcharging can be just as damaging. - When voltage is extremely high and erratic, it often points to a regulator sensing issue rather than a simple regulator failure. - Always verify the charging system operation after replacing an alternator to prevent immediate damage to a new component or other electronics.