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How to Replace a Voltage Regulator

The voltage regulator ensures a consistent charging voltage from the alternator to your cars battery. A faulty regulator often results in a dead or damaged battery. Generally, manufacturers equip cars with some type of warning system to notify owners of a regulator problem. When you see the warning light on the dash, consult a professional unless you have some auto repair experience. If you do the repair yourself, review repair instructions for your specific car before replacing your voltage regulator. Depending on the manufacturer, you may have to perform different steps.

Instructions

1

Put on the work gloves, and open the hood. Take the ground cable off of the battery.

2

Remove the wires from the broken regulator. Bind the end of the battery wire with electrical tape. This avoids any potential sparks that might occur if the wire rubs any metal parts. detach the regulator from the alternator by removing the adhering bolts or screws with the adjustable wrench or screwdriver.

3

Look at the bottom of the regulator for the two carbon brushes. Remove them and use the sandpaper to carefully clean the contact ends of the brushes. Apply electrical contact cleaner to the brushes, and insert them into the new regulator. Match the wear patterns on the brushes to the patterns on the new regulator. If the patterns do not match, the regulator will not work correctly.

4

Connect the new voltage regulator to the alternator carefully, making sure not to damage the brushes. Secure the regulator with the bolts or screws and attach the wires using the adjustable wrench or screwdriver, Reattach the ground cable to the battery and close the hood.

5

Start your car, and run it at 1,000 to 1,200 rpm. Look at the voltmeter on your dashboard to check the battery voltage. If voltage is not in the 13.5 to 14.5 range, read your regulator instructions on how to adjust the voltage. Recheck it after you make the adjustments.