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Old 05-25-2018, 03:04 PM   #1
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Shorted coach batteries

Unit is a FR 2401W MB Sprinter. Dropped a wrench on coach batteries with battery switch OFF. Now nothing will work in the coach on 12 volts. Several lights will work with engine running. The lid fell hit my hand and I dropped the wrench while hooking up the coach batteries. There is an 80 amp buss that the batteries hook into perhaps that got fried. Any suggestions would be appreciated
Thanks,
Mike
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Old 05-25-2018, 03:06 PM   #2
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Have you measured the battery voltage with a meter yet? Was the converter on when this happened?
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Old 05-25-2018, 03:23 PM   #3
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All systems were off. Have not measured volts yet. My meter is missing
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Old 05-25-2018, 05:08 PM   #4
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Depending on where the actual short occured, there might be a "Fuse Link" that is now burned out. Often just a piece of heavy wire designed to burn before a fire starts. Start at the battery and see if you still have power there. Then chase it down the wires, both positive and neg/ground, until you loose it.

Your accident illustrates why it's a good idea to have a rubber mat (old mud flaps work great for this) across the top of your batteries so if a tool or other metal piece falls on them for any reason you don't end up with a failure. Even worse, a fire.

It's required practice on boats to keep the batteries covered and protected against accidental shorts. The amount of current that can be discharged through a tool is huge and can lead to battery explosions or fires.
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Old 05-25-2018, 05:12 PM   #5
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Check your reverse battery fuses on your converter just a hunch
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Old 05-27-2018, 07:20 AM   #6
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Ok, so I just discovered my problem. Sometimes a mistake can save you. Yes I dropped wrench and shorted out batteries. However missed hooking up the negative ground wire so the coach systems were I damaged . Also I am not a newbie. Have owned 5 motorhomes and I can still make mistakes Thanks to all that responded
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Old 05-27-2018, 06:14 PM   #7
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That is why I bought a HD Composite ratchet. I keep it in the MH but use it a lot on other electric work.
https://www.harborfreight.com/hand-t...het-66312.html

Frank
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