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Why does a truck voltage gauge vary?

Updated: 10/22/2022
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15y ago

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My question to you is how much does it vary? Does it start to drop when you turn accesories on? Does it fluxs' with the RPM's of the Engine? How old is your truck? As time goes on the Alternator will start to degrade some. Some of the grounding spots for the electrical systems over time will build up corrosion and cause the system to work harder and cause the voltage to flux. You can take your vehicle to most parts stores and they can run a test to see if the alternator is weak or battery. If you have added anything to the electrical side it could be putting a strain on the whole system. Newer vehicles today are becoming more and more dependant on electrical system. There has been talk of upping the voltage to 24 or 32. I would also have to ask has this been all of the sudden or just something that has steadly becoming more noticeable?

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15y ago
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Q: Why does a truck voltage gauge vary?
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