GMC Battery Low Voltage
- Thread starter Birchwood
- Start date
branson4020
Icantre Member
How old is your battery? Do you have one or two?
Other things draw down the battery like your radio even if it is turned off. Any sort of security alarm. Remote or key-less entry. Not sure about this, but the computer may need a trickle also. So many new new things that make life easier have a payback in constant battery drain. Etc.
This is where I would start as well. If they are over 3 years old, I would have them checked and replace them in pairs if you have 2.
Bob&Patty
Founders of SoCal Chapter
Take the TV to a battery shop or your dealer. Have both batteries charged and checked. Anything under 9 volts under a load test, the battery is bad. Each battery has a "cold cranking" amperage sticker on it. You have to load the battery to close to that to determine if the battery is good or bad. It should hold the load for at least 30 seconds. Amperage is what turns the starter not voltage. You have to do this with the batteries disconnected from each other. You cannot check them any other way. You will get a false reading. Have you checked the cables for looseness or corrosion at the batteries?? 1 bad battery will kill the cranking power to the starter.
porthole
Retired
With my GMC I have gone for weeks parked with no issues. Other times after 3-4 days the batteries would be dead. Never found a cause.
There were times I would leave my GPS plugged in and on for several days and that would not cause an issue. Ohter times I would turn off everything I could thinks of and still end up with a dead battery.
One time trying to start the truck with dead batteries my engine hour history reset to 0.
I fixed it with a 2011 F-350
There were times I would leave my GPS plugged in and on for several days and that would not cause an issue. Ohter times I would turn off everything I could thinks of and still end up with a dead battery.
One time trying to start the truck with dead batteries my engine hour history reset to 0.
I fixed it with a 2011 F-350
branson4020
Icantre Member
porthole
Retired
Ah yup - 2 new batteries - and the GMC batteries were only 9 months oldSo, I guess that means you got new batteries.
mmomega
AnyTimer
Awesome fix I did the same thing Porthole.
Our '07 was having this problem 1 week after I bought the 2011, alternator was fine, 2 Interstate batteries less than a year old and they tested bad. Just all of a sudden they wouldn't hold a charge more than 5-6hrs before the truck wouldn't start. The other batteries were still under warranty so, 2 new batteries and the truck has been completely fine(so far).
Our '07 was having this problem 1 week after I bought the 2011, alternator was fine, 2 Interstate batteries less than a year old and they tested bad. Just all of a sudden they wouldn't hold a charge more than 5-6hrs before the truck wouldn't start. The other batteries were still under warranty so, 2 new batteries and the truck has been completely fine(so far).
jnbhobe
Well-known member
AH!!! I told ya so. Seen it happen a lot of times, glad your ok now!!
