Voltage jjumping 1992 ford f250

Asked by Oct 31, 2016 at 06:11 AM about the 1992 Ford F-250

Question type: Maintenance & Repair

My truck is running fine but the voltage
keeps bouncing. My lights will get dim
then bright. Open for advice

2 Answers

82,905

Sounds as if your have a loose connection on a wire. I would look over as much as the wiring as you can to see if you can find anything.

77,845

After you have checked the wiring, grab your voltmeter and check the output voltage from the alternator, voltage should be 13.2 to 14.8 volts, if voltage is not stable then replace the voltage regulator, and if the brushes are worn best to replace them also, then have your battery load tested, a weak battery can cause this also.

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