Truck off but headlights still able to turn on?

Left the battery connected all night with the meter on. Checked it at midnight as well as 7am this morning and meter never changed.

checked the battery and its down to 12.1v without the key on and when turning the key to accessory it dropped to 11.8.(this was 7AM this morning)

It was 12.6v yesterday when I parked it at around 4/4:30 pm.

going to now leave the battery totally unplugged and see what happens.

 

Ya your battery is probably just toast but see what it does. Does it have enough power to start the truck after you charge it with the charger disconnected?

 

Not likely per se but not out of the question, I've had batteries go in about a year in our area.

It should be that way, my 2010 is the same.

 

Probably should have load tested the battery and not just trusting a full charge. Battery ended up only having around 400 cranking amps and it’s a 710. Battery was still under warranty so let’s hope this one lasts…

 

As I suspected. My friend's car battery went in a year or so and not heavy mileage/load/etc either.

Good news, that gremlin is finished with.