What should my battery voltage be while running?
Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights.
Why is my voltage gauge low?
If system voltage is low, the voltage regulator or alternator are suspect, and should be checked and replaced as appropriate. Bad battery connections will degrade system performance somewhat as well.
What causes battery gauge to drop while driving?
Batteries Corrosion An alternator and a battery connected by wire; that’s why you need to check those wires for corrosion. A bad connection between the alternator and battery and corrosions around the battery can cause battery gauge drops while driving.
Why does my voltage guage only show 9-10 volts?
My voltage guage usually points near the red mark at 9-10 volts. Batteries cranks the starter quickly and it does not seem to lack any electric power. Some times driving, it will raise to about 12 V, but never above, and the next minut point at 9 again.
Why does the battery gauge go back to 12 volts?
When your gauge read ~12volts and a new battery it went back to 15 volts, the old battery was overloading the alternator with an internal short. At one time I had a battery short bring it down to 9 volts and the computer went nuts. The engine back fired I just made it to a battery shop.
What should battery voltage be on GM Truck?
It appears the needle fluctuates between 12 and 15 or volts. The battery gauges on most vehicles I have owned stays around 13 to 14 volts and doesn’t move much unless something that consumes a lot of power is turned on. Mine does this with nothing additional running on the truck other than the radio and a/c.
Is it normal to exceed generator amperage when idle?
With enough electrical loads “ON”, it is easy to exceed the generator current (amperage) output when the engine is at an idle of 600-700 RPM. This is a normal condition.