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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 07:48am Link  |  Quote  |  Print  |  Notify Moderator

Both truck batteries totally disconnected read 11.35


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mattyj

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Posted: 06/04/21 07:49am Link  |  Quote  |  Print  |  Notify Moderator

I’m wondering if the airbags on the truck which I was using last night could have been the culprit, I don’t know if there’s a switch to turn them off or you just leave them and turn the ignition key off and they’re off

bighatnohorse

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

You need to check the battery fluid with a hydrometer.
A hydrometer is easy to use, inexpensive and available at all or most auto parts stores.
If the battery has a dead cell then it is toast - it won't charge up again. It's toast.

mattyj

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Posted: 06/04/21 08:18am Link  |  Quote  |  Print  |  Notify Moderator

bighatnohorse wrote:

You need to check the battery fluid with a hydrometer.
A hydrometer is easy to use, inexpensive and available at all or most auto parts stores.
If the battery has a dead cell then it is toast - it won't charge up again. It's toast.
these are seal batteries

joerg68

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Posted: 06/04/21 08:34am Link  |  Quote  |  Print  |  Notify Moderator

Re. Airbags: the airbag compressor is not continous duty. I doubt it will survive running long enough to pull down two batteries.

some more thoughts:
What voltage does the camper battery show?
There are not many electrical consumers in a truck or camper that can run down two (or possibly even three, with the camper battery) fully charged 70-something Ah batteries in one night. Leaving the truck lights on, or the fridge on 12V, might. A single dome light won't do this.
Do you know if you have a battery separation switch of sorts between truck and camper?
Having the camper on shore power does not necessarily guarantee that the fridge is running on shore power, though it normally should. But it may have been inadvertently set to 12V, or something may have gone wrong.
15 minutes is not long (enough) to charge the batteries. You'd need to know what their voltage was before the jump start.
In any case you need to find out if the problem is with the truck or the camper.


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rexlion

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Posted: 06/04/21 08:55am Link  |  Quote  |  Print  |  Notify Moderator

I would use a standalone charger to recharge the truck batteries while the cables are off the terminals, then check their voltages a few times over the next several hours. If the voltage falls off quickly on one or both with nothing hooked to them, one or both have gone bad (unlikely for both at once, but not impossible). If they stay at a reasonably high voltage, hook them back into the truck (camper line disconnected) and check their voltage again in an hour or so. Then if need be, hook the camper back to the truck and again test battery voltage in an hour or so. I think most likely it's a drain from the camper, but the other possibilities must be eliminated first.


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mattyj

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Posted: 06/04/21 09:01am Link  |  Quote  |  Print  |  Notify Moderator

joerg68 wrote:

Re. Airbags: the airbag compressor is not continous duty. I doubt it will survive running long enough to pull down two batteries.

some more thoughts: I checked the voltage of the batteries and they kept dropping even know the The truck was running so I am bringing it to the shop I think it is the alternator, I am annoyed this happened but it could’ve been worse I could’ve been on the road. Thank you for your responses thank you sir
What voltage does the camper battery show?
There are not many electrical consumers in a truck or camper that can run down two (or possibly even three, with the camper battery) fully charged 70-something Ah batteries in one night. Leaving the truck lights on, or the fridge on 12V, might. A single dome light won't do this.
Do you know if you have a battery separation switch of sorts between truck and camper?
Having the camper on shore power does not necessarily guarantee that the fridge is running on shore power, though it normally should. But it may have been inadvertently set to 12V, or something may have gone wrong.
15 minutes is not long (enough) to charge the batteries. You'd need to know what their voltage was before the jump start.
In any case you need to find out if the problem is with the truck or the camper.


time2roll

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Posted: 06/04/21 09:03am Link  |  Quote  |  Print  |  Notify Moderator

Charge or jump start the truck. Once running check the voltage after the jump cables/charger is removed. If you see 13.5+ volts from the alternator I would roll.


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Lwiddis

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Posted: 06/04/21 09:10am Link  |  Quote  |  Print  |  Notify Moderator

Running batteries down to "dead" harms them. Your new batteries may never perform as well as expected. Sorry


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joerg68

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Posted: 06/04/21 09:38am Link  |  Quote  |  Print  |  Notify Moderator

No charge from the alternator might be a reason. You could have run them down the night before while you were running the truck, thinking they would be charged.
I wish you luck!

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