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Old 06-18-2020, 07:45 PM   #1
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Dual battery hook up

Hello all.. i have made a very amateur mistake and did not take a photo before i began work. So i had to replace my dual batteries and thought it was just a simple series - to +. Well come to find thats wrong and then if one cable is to be - and the other + then that also does not work... so if any one has a wiring diagram for a 97 ford e350 Grand Batam Collins build bus or can tell from the pic would he greatly appreciated.
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Old 06-20-2020, 06:15 AM   #2
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Judging by the picture one cable will go to both positive and the other cable to both negative side I would trace the cables back to find out what cable is the negative by finding it ground to the frame or motor so that I know for sure and do not cross them.
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Old 06-20-2020, 09:17 AM   #3
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What do you mean by "Does not work"

You should be able to hook one cable to both -(neg) and one cable to both +(pos) and be on your way.
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Old 06-20-2020, 09:59 AM   #4
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Did you connect the batteries to the bus in series + to - ?

You don’t want to do that.

If you have, you may want to start looking at your fuses.

Are these batteries next to each other on a tray or in a compartment?
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Old 06-20-2020, 10:27 AM   #5
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if you hook it up backward you will have some blown fuses. Or worse.
I learned all about this recently when installing a battery on my wife's miata.
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Old 06-22-2020, 01:03 AM   #6
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Quote:
Originally Posted by DixonM View Post
Judging by the picture one cable will go to both positive and the other cable to both negative side I would trace the cables back to find out what cable is the negative by finding it ground to the frame or motor so that I know for sure and do not cross them.
Exactly. Also based on the picture of the cables, you will want to turn on battery around so that the cables connect negative to negative and positive to positive with only slightly bending (curving) the cables.
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