i have a 95 gmc sierra 1500, when i start the truck and idle the voltage gauge reads 14 but as soon as i set on the gas the voltage jumps to almost nineteen and the head lights brighten consideraly. a

Greg Dootson

Asked by Sep 06, 2016 at 10:39 AM about the 1995 GMC Sierra 1500

Question type: Maintenance & Repair

voltage gauge shows increase to nearly 19 volts and headlights brighten  when accelorator is pressed. upon release voltage drops to normal

3 Answers


Use a separate voltmeter on the battery just too confirm the overcharging, It should be between 13.8 to 14.7 volts. If it is higher than that the voltage regulator is most likely the culprit. It is inside the alternator, and can be replaced if your careful, also check the bushes while your there, they may also need replacement. Or just replace the entire alternator. You should also have the battery tested, overcharging can ruin a good battery in a short period of time.

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Greg Dootson

thank you thats what i suspected, but needed confirmation. thank you youve been very helpful, especially with my wifes lack of confidence in me about everything except sex of course.


OHBOY watch out for that stuff, it only leads to trouble.

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