Battery Voltage Fluctuation

[2001 TX Tahoe]

2016 GMC Yukon XL SLT. Relatively new Odyssey battery. I noticed on a road trip this summer the voltage gauge fluctuating while highway driving. Sometimes it would be centered on 14V, but it was often dropping down into what looked like the 11-12 range. I didn't notice any issues that might be related to low voltage other than my 12V fridge in the rear, which was plugged into the 12V plug in the rear, was beeping due to low voltage and showed voltage that varied between 10.5 and 12.5.

 

[B-train]

They are programmed to cycle on and off to help with fuel economy. If you need more reserve, you can add an additional battery in parallel. There's a mount already in the truck for it behind the drivers headlight

 

[2001 TX Tahoe]

They are programmed to cycle on and off to help with fuel economy. If you need more reserve, you can add an additional battery in parallel. There's a mount already in the truck for it behind the drivers headlight

Got it, thank you!

 

[Joseph Garcia]

Totally normal. Kind of freaky, until you are advised that it is normal.

 

[HomeMadeSin]

This piqued my curiosity also. Took the first long trip (‘18 XL Denali 6.2 4x4). Voltage fluctuated from a touch over 14v to about 12.5V. Glad to hear it’s by design.

But let me say that whomever was responsible for using 9v, 14v and 19v as markers spread over 8 graphically equal divisions…well hopefully “the fleas of a thousand camels invades his/her crotch.”

z

 

[Fless]

This piqued my curiosity also. Took the first long trip (‘18 XL Denali 6.2 4x4). Voltage fluctuated from a touch over 14v to about 12.5V. Glad to hear it’s by design.

But let me say that whomever was responsible for using 9v, 14v and 19v as markers spread over 8 graphically equal divisions…well hopefully “the fleas of a thousand camels invades his/her crotch.”

z

"Whomever" wanted you to not expect the gauge to be accurate.

 

[HomeMadeSin]

A more rational nemesis would’ve used ‘L’ and ‘H’ and called it good.