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?
Electrical connection issue.
Perhaps a defective voltage regulator- not regulating voltage Perhaps a defective gauge-
That light notifies you that one of the gauges is out of its normal parameter. Check the temp (overheating), the voltage (not charging) and the oil pressure gauge (low or no oil pressure).
They vary with what load is placed on them from 12 ga to 22 ga and all in between
The voltage regulator is responsible for regulating alternator output. Look at the volt gauge in the dash. If it is too high generally that means that the regulator is bad. Take the truck to Autozone and have them check it for you. They offer this service free of charge and will do it on the truck.
Either the gauge or the voltage regulator device on the charging system has failed.
The voltage does not depend on the gauge of the wire, but on the thickness and type of insulation.
You can vary the induced voltage by varing the speed of the rotor.
The voltage gauge on the Blazer is not the most accurate (cheap) When using the signals the voltage draw on the system is enough to make the gauge move slightly.
A short in the turn signal wiring can cause the voltage gauge to fluctuate. A loose ground wire can also cause the gauge to fluctuate.
10
The truck doesn't have a freon pressure gauge. That is a tool that the repairman/mechanic has.The truck doesn't have a freon pressure gauge. That is a tool that the repairman/mechanic has.