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 > About to leave, truck batteries are dead question

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mattyj

Long Island.New York

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Posted: 06/04/21 06:48am Link  |  Quote  |  Print  |  Notify Moderator

Hello everyone, I loaded the camper last night packed everything up had the truck running idling for a while no problem. Today I go to start truck batteries are dead and I can’t figure why the meter is saying the camper battery is OK, lights work.Can anybody help me with this? Thanks


2006 Ford F 350, 6.0 PSD 8 Foot Bed 4x4 with Torklift Tie downs and Stable Loads 2004 Lancelite 835 ,a/c ,electric jacks , conveince/all weather packages

joerg68

St. Ingbert, Germany

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Posted: 06/04/21 07:08am Link  |  Quote  |  Print  |  Notify Moderator

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.


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Dick_B

Palos Heights, IL USA

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Posted: 06/04/21 07:09am Link  |  Quote  |  Print  |  Notify Moderator

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 :-(

* This post was edited 06/04/21 07:25am by Dick_B *


Dick_B
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mattyj

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Posted: 06/04/21 07:12am Link  |  Quote  |  Print  |  Notify Moderator

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

mattyj

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Posted: 06/04/21 07:13am Link  |  Quote  |  Print  |  Notify Moderator

Correction I am now going to test the batteries

joerg68

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Posted: 06/04/21 07:14am Link  |  Quote  |  Print  |  Notify Moderator

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

NRALIFR

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Posted: 06/04/21 07:18am Link  |  Quote  |  Print  |  Notify Moderator

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.

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* This post was edited 06/04/21 07:25am by NRALIFR *


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mattyj

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Posted: 06/04/21 07:38am Link  |  Quote  |  Print  |  Notify Moderator

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

mattyj

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Posted: 06/04/21 07:43am Link  |  Quote  |  Print  |  Notify Moderator

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

mattyj

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Posted: 06/04/21 07:44am Link  |  Quote  |  Print  |  Notify Moderator

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

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