stupid duty

[LEB Paul]

SO I put on my Ford "its the american way" T shirt eysterday to go celebrate the 233rd of this great country, load my cooler full of ice cold bud light, get out to my truck, turn the key and.. nothing. Fawkin batteris daed. Jump the POS, and drive oever to my gf's for the celebration, consume much alcohol, sober up.. time to go home.. dead again. Jumped again, dead this morning. Take to autozone to have batteries tested, even though i don't think it's them. Their machine says charge and try again. I just got the batteries a few months ago, so fairly certain it isn't them.

Sounds like alternator, but all my accesories .. radio, ac, lights work fine and aren't dimming whiel I'm driving around. Decided to ride a 4 wheeler and get drunk instead of working on it tonight, but I think my next step is to pull the alternator off and have it checked, yah?

The battery charger is on it right now, maybe the gps and phone charger drained it enough that the altenator couldn't charge it up just driving around for a little bit?? don't think so with dual batteris, but?

 

[Skandocious]

Yeah that does seem a bit strange. How long did you drive it between jumps? I reckon it'd take quite a bit of driving to get both batteries back up to the point where they could fire that thing up.

 

[john112deere]

Any chance you've got a dome light staying on (or some other drain) that's killing your batteries while the truck is parked?

 

[LEB Paul]

The thing is the truck ran for 5 straight hours before i parked it the night before and then it wouldn't start the next night. The dome lights stays on for a minute or so afetr i shut the door. The GPS and phone charger are always on, but i wouldn't think they would be able to drain down two big ass diesel batteries???

Between jumps though was maybe 10-15mins, if that.

 

[DNFXDLI]

Any starting battery no matter what the size is not designed to have a continual draw placed on it....I don't know if that is the issue here, but that is the case with standard vehicle batteries.

 

[Bricks]

Load test the batteries first - if one of them is bad it'll pull the other one down. I've gotten new batteries that were NFG before.

BTW - these trucks do not like being started with lower than normal voltage. It can cause problems with the electronics, particularly the FICM.


What's the CCA rating of the batteries?

 

[LEB Paul]

850 I think. I'm pretty sure what autozone did was a load test, and they said they needed to be charged.. they were only showing between 8 and 10 volts on the test.

 

[DNFXDLI]

10.6 volts is 100% discharged.

 

[Bricks]

^^^^

What Duncan said.

They can't load test them unless they're charged.