A fully charged battery should read 12.6 volts or above. When the engine is running, that number should be between 13.7 and 14.7 volts. There could be a charging issue going on if your alternator is going bad, not getting the battery voltage up high enough. If this is the case, your alarm will continue to alert you of a low battery as the voltage drop when the car is on or running will drop the voltage further. I would suggest taking your car to a parts store that does on the car battery load testing. This can find if your alternator is going bad.
SOURCE: 2000 elantra no power to fuel pump.
could be a bad earth or [ground]
the power wire ma be brocken or have a loose or dirty connection
you neeed to trace it along its lenght to determine the fault!
so start at the pump & work back
Cheers rob
SOURCE: 94 f150, 4.9. No ignition fire. Replaced stator,
check the cam and crank sensors now. If at fault no signals will be given to produce spark to fire
SOURCE: when the Jeep was new the volt meter read 14
Generally the standard voltage should be 13.5 to 15.5 depending on the load that is being put on the vehicle and age of the battery an older battery may require more voltage to charge. Unless the voltage drops below 13 you are probably ok.
SOURCE: 2006 Chevy Silverado alternator intermittent charging
Perfectly normal.
Starting with the 2005 model year, light duty full size pickups and
utilities are equipped with a new Regulated Voltage Control (RVC)
system. This system reduces the targeted output of the generator to
12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy.
The generator may exit "Fuel Economy Mode" if additional voltage is
required. This will cause the voltmeter to fluctuate between 12 and 14
volts as opposed to non-regulated systems that usually maintain a more
consistent reading of 14 volts. This fluctuation with the RVC system is
normal system operation and NO repairs should be attempted.
SOURCE: 2002 chevy tahoe 5.3 LS.
Check the wiring and connectors going to the alternator. It appears you have a bad connection or broken wire - that would cause intermittent flashing of the alternator light or a steady glow, depending on how bad it is. Pay special attention to the alternator output wire going to the battery - you may not have a clean, solid connection to the new terminal.
As an aside, a leaking seal around a battery post can cause significant deterioration of the terminal connections in a few days. After several bad experiences, I always apply a counter-torque to the battery terminal with one hand while I tighten the terminal clamp bolt with a wrench in the other hand. The counter-torque keeps the wrench from applying force to the battery post and cracking the seal. Since I started that practice, I've had very little trouble with terminal corrosion.
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