How To Troubleshoot An Alternator On A Semi-Truck

How To Troubleshoot An Alternator On A Semi-Truck


Understanding the Symptoms

Start by observing the symptoms. You may notice dimming or flickering lights, battery issues, or a dead battery. These are usually signs of alternator problems.

Checking the Alternator

First, make sure the alternator belt isn’t loose or damaged. If the belt is in good condition, test the alternator output using a voltmeter. The reading should be between 13.8 and 14.2 volts.

Inspecting the Battery

Check the battery. If it’s not holding a charge, the problem might be the battery, not the alternator. If the battery is good, consider other possible issues with the alternator.

Replacing the Alternator

If your alternator is beyond repair, it may need to be replaced. This is a job best left to the professionals to avoid further damage to your semi-truck.

Alternator Replacement

Auto Electric Re-Builders specializes in alternator replacements. Visit us at 830 John Counter Blvd, Kingston, ON K7K 2R1, Canada or call us at +1 613-544-7466 to schedule an appointment.