What should the battery gauge read when the engine is not running?

What should the battery gauge read when the engine is not running?

A fully charged battery should read about 12.5 volts when the key is in the ignition and turned partially, but the car’s engine is not running. Step 2 Look at the voltmeter while the engine is running. Readings of 14 to 14.5 volts on the gauge when as a good sign.

How to diagnose battery Guage on a GMC Yukon?

The engine computer (ECM/PCM) will ramp up engine/generator speed in small steps so engine speed variations are not noticeable to the driver. For diagnosis of the battery and/or the generator, refer to the appropriate Service Information (SI) or Corporate Bulletin Number 05-06-03-002C.

Why does my battery Gage go up and down?

Sometimes it will sit at 11.5, sometimes at 14, sometimes at 16.5. It will sometimes adjust itself while driving, but the truck seems to be running without a problem. I haven’t had the battery tested, but I’m wondering if the symptoms above give any indication as to what the issue might be. Faulty gage? Battery issue? Alternator issue?

What’s the battery reading on my Silverado truck?

I traded that vehicle in for this truck. My Silverado is very inconsistent with it’s reading. Sometimes it will sit at 11.5, sometimes at 14, sometimes at 16.5. It will sometimes adjust itself while driving, but the truck seems to be running without a problem.

A fully charged battery should read about 12.5 volts when the key is in the ignition and turned partially, but the car’s engine is not running. Step 2 Look at the voltmeter while the engine is running. Readings of 14 to 14.5 volts on the gauge when as a good sign.

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.

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.

The engine computer (ECM/PCM) will ramp up engine/generator speed in small steps so engine speed variations are not noticeable to the driver. For diagnosis of the battery and/or the generator, refer to the appropriate Service Information (SI) or Corporate Bulletin Number 05-06-03-002C.

How can I tell if my car battery is fully charged?

Cars operate on a 12-volt electrical system. A fully charged battery should read about 12.5 volts when the key is in the ignition and turned partially, but the car’s engine is not running. 2. Look at the voltmeter while the engine is running. Readings of 14 to 14.5 volts on the gauge when as a good sign.

What does a negative battery reading mean on a car?

This means that the battery is fully charged and the charging system is providing the current. A negative reading (below zero) means the battery is providing current, and unless the problem is corrected, the battery will go dead.

What can cause a car battery to drop?

The vehicle’s computers, clocks and the like will cause the battery state of charge to drop (For example; 30 days in a parking lot and the vehicle may not start because of a dead battery or a vehicle which is driven only a short distance once a week may end up with a discharged battery to the point where the vehicle may not start).

Why does my old car battery not crank?

If the vehicle will not crank when the battery is known to be good, we won’t have to backtrack and check it again. When it comes to vintage cars and batteries the biggest problem is when unexpected long-term storage occurs. Sometimes we park our classics expecting to use them in the near future.

Why does my GM car say no start no crank?

How to diagnose a no start no click on GM vehicle. If you have a late model GM vehicle and turn the key only to hear nothing, you’ll most likely think you have a dead battery—and you may. But a no start, no crank, no click condition can be far more involved than that.

What’s the battery gauge on my Chevy Silverado?

Yesterday it had not flickered at all when turning the key to start. But, yesterday the battery gauge went to 0 when trying to start. Today it went down just a bit while cranking, went to 0 for a half second, and jumped back up to 14 when it started.

Where does the 12 V go in a no crank car?

With the ignition key in the on position, there should be power on the heavy gauge red wire and a strong ground on the black wire. When the ignition key is pushed to the crank position you should have an additional 12 V going into the relay and 12 V comes out on the wire that runs to the starter solenoid.

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