About to leave, truck batteries are dead question

Both truck batteries totally disconnected read 11.35

I will disconnect each battery on the truck and test again when I tested the first time they were connected thanks

joerg68 wrote:
I amended my first reply, pse re-read if you haven't yet.

. I had to camper plugged in to AC at my house and I just jump started the truck and it started and I shut it down 15 minutes later it won’t start again

The truck batteries are 11.38 volts and the camper battery is 12.56 if anyone can help me.

Yeah, start with checking the battery’s voltage. Disconnect one of the cables on each battery and check each one separately.

Are there any accessories connected directly to either battery?

Normally on Ford’s, the 12v charging circuit from the truck is running through a relay that isolates the camper from the truck when the engine isn’t running. It’s not hard to defeat that though of you want to. As joerg said, make sure it’s not the camper that ran the truck batteries down.

:):)

I amended my first reply, pse re-read if you haven't yet.

Correction I am now going to test the batteries

Thanks for responses the battery in the camper is new in the truck batteries are new I am not going to go get a tester and try to check the voltage

Not much to go on but we had battery problems with our Suburban due to electronics using juice overnight even tho we supposedly had everything else turned off.
How old is the truck battery? Did you accidentally leave a dome light on overnight?
Better to get the battery tested by a pro. My auto dealer told me that they find bad batteries in the new cars just off the truck :-(

The one thing that will run down the batteries in no time is a 3-way fridge running on 12V at 120-200 watts. Can you exclude that as a reason?

First, unplug camper to eliminate any cause from that side.
What voltage do the truck batteries read?
What voltage does the camper battery read?
How old are the batteries?
Do they accept a a charge? Either from an external charger or from the truck alternator after a jump start?

Possibilities:
Truck battery died
Lights or other electrical device left on
Excessive load from camper, see beginning of my post (but that doesn't seem to rhyme well with your story)



Not a professional here, better opinions welcome.