somthings killing my batterys?

[hummer_maxxer]

after having my truck fully charged and letting it sit for about 5 days, when i came to start it, it barely started, battery were really weak. is this a common problem. my brothers also has a 7.3 power stroke and has the same problem as me???

[Eric]

How new are your batteries? You have to have a draw somewhere. After I installed my lift, my truck sat for 3 weeks and it started right up

[spikinfool05]

how old are the batteries? maybe time for some new ones. if a load tester is handy test them. if not any local part store can do it. if they say they are bad watch them load test them. if they are get some good ones. your perfence is what matters then the more cold cranking amps the better. good luck.

[hummer_maxxer]

the batterys are good, the one is new and the other was tested

[jethro]

batteries should be replaced as a pair. one new one old is not a good combo

[hummer_maxxer]

yes im aware that they should be changed in pairs, but thats defanetly not the problem here because my brother changed both his batterys last year and still has the problem

[jethro]

do you have any add ons to your truck? and if you knew to replace as a pair why did you do one??

[hummer_maxxer]

trucks stock just bought it from the dealer and they would only replace the bad battery, i am planning on replacing the other one shortly

[BB540C2]

My truck is doing the same thing Installed new batteries the truck sits for a few weeks the no start Is there a way to check and see if there is a drain on the system

Thanks,
Carl

[lightn95]

mines been doing the same thing. turns out to be my general modual (GM) controls the horn, int. lights, other misc. things.
try pulling the red 5 amp. fuse in the center of your fuse box. see if thats your draw.
good luck