Starting Battery
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Freshman User
Joined: Oct 2006
Posts: 30
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From: Tucson, AZ
Starting Battery
2007 F250 6.0L PS
I've wondered about this but never really worried about it until we had to jump start another diesel (7.3L) recently.
With a dual battery setup in the diesels, is one for starting (i.e. cranking the engine) and the other to run accessories (i.e. FICM, engine computer, etc.)? Which one should jumper cables be attached to for jump starting?
The owner's manual just shows one battery diagram and tells you to connect + to + and - to -.
I've wondered about this but never really worried about it until we had to jump start another diesel (7.3L) recently.
With a dual battery setup in the diesels, is one for starting (i.e. cranking the engine) and the other to run accessories (i.e. FICM, engine computer, etc.)? Which one should jumper cables be attached to for jump starting?
The owner's manual just shows one battery diagram and tells you to connect + to + and - to -.
Postmaster
Joined: Jul 2005
Posts: 3,956
Likes: 6
From: Abilene, Texas
no they are wired in parrael (spelling???) meaning they are wired together to give you more cca. it really don't matter witch battery you connect jumper cables to you will still get the same output. it's still a 12 volt system just gets more amps out of it since the positives are hooked together.
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Freshman User
Joined: Oct 2006
Posts: 30
Likes: 0
From: Tucson, AZ
Re: Starting battery
Thanks for the info! That explains why BOTH batteries drain when the radio or lights are left on too long. I was thinking that one was isolated from the other.
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Postmaster
Joined: Jul 2005
Posts: 3,956
Likes: 6
From: Abilene, Texas
no if you look at the passenger side battery you can see the positive (red) cable that runs from it in front of the radiator to the drivers side battery positive.
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Post Fiend
Joined: Oct 2009
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From: N. Fort Worth, tx
you all have the right awnser....
if possible hook to the passanger side battery if trying to jump start your truck. as it gets the load closer to the sorce of the voltage and seems to work better, or its just me getting a warm fuzzy feeling when I do it. if jumping off some else it wont matter what ever is closer.
if possible hook to the passanger side battery if trying to jump start your truck. as it gets the load closer to the sorce of the voltage and seems to work better, or its just me getting a warm fuzzy feeling when I do it. if jumping off some else it wont matter what ever is closer.
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