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The battery (or batteries) would be similar to automotive batteries. Best thing to do is remove the battery you have and take it to an automotive store to get a direct replacement. The features of the batteries vary, just like automotives, and the type of posts/connector needs to be the same to make it easy to reconnect to your camper. Take your battery to the auto store to have them check it first before you spend money to replace. Many times, it may need a charge, rather than a replacement. If you do have to replace, make sure you get a marine deep cell battery. They do run a bit more but for what they are used for, much more suitable and a better life.
If you are referring to a camper, the 12 volt auto battery powers them. Fully charge the battery first. there is a switch inside the camper to power the motors be sure its turned on. A lot of campers seem to have a problem with poor wire connections and broken wires. clean all connections check for broken wires and check fuses. good luck.
i am asssuming that you are talking about your coach battery bank.are they 12 volt or 6 volt battery system. the arc is a short. check polarity. can you charge the batteries with an external battery charger? if so. then need to check converter output from your mian power panel. there are a few other things to check. need more specifics. and you need to have a volt meter handy.
POWER SUPPLY & BATTERY PROBLEM If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced. Rechargeable batteries will fail if stored in a discharged state for long periods.
If thelaptop battery is more than 3 - 4 years old then the battery could be worn out.Rechargeable batteries have a finite number of charge and discharge cycles andwill lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up at all. OR Thebattery shows a 100% charge but when the adapter is disconnected the batterydrops off to zero capacity in a very short time. If the battery drops to anunacceptable charge level then the battery needs to be replaced.
The extra battery is there because of the glow plugs and intake heater of the duramax. During cold weather both of these systems draw high amperage from the batteries. A single battery will function, but not as well as a pair.