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Old 04-07-2022, 09:38 AM   #1
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Battery replacement procedure

I am planning on replacing both chassis and house batteries on my 2016 DS and remember reading somewhere on the forum that there is a proper sequence to unhook batteries to protect the inverter? Any help with this procedure would be greatly appreciated.
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Old 04-07-2022, 09:48 AM   #2
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Remove positive first from the house batteries to protect the inverter.
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Old 04-07-2022, 10:11 AM   #3
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And take pictures and mark the battery cables, so you don't have the same issue many others have faced after replacing batteries.
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Old 04-07-2022, 10:14 AM   #4
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Pictures! Pictures! Pictures!
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Old 04-07-2022, 10:37 AM   #5
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Quote:
Originally Posted by UMXHAULER View Post
Remove positive first from the house batteries to protect the inverter.


On my VTDP Freighliner Chassis the above recommendation holds for house / inverter but interestingly for chassis FL recommends disconnecting NEG first. I questioned this as the chassis batty switch is on Pos but I learned that yhere is a bypass that provides constant power to engine computer.

In addition to pics not a bad idea to ID cables with masking tape and letters / #s and draw a diagram of battys & cables that have letter / #s.
Pics can get confusing where cables cross and terminals not easily identified with each cable.
If all cables are not the same length each having an ID ensures you get them back where they came from instead of trial & error.
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Old 04-07-2022, 11:44 AM   #6
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If you have a Spartan chassis (for chassis batteries)
Turn off both switches in chassis battery compartment
Pull fuse F10 (in round fuse cover to the right of the disconnects)
The Spartan SCM was damaged when I did not pull fuse F10.
Spartan covered it because it was not in writing to pull the fuse.
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Old 04-07-2022, 04:02 PM   #7
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I have a FL chassis. In regards to the chassis batteries, does anyone know what the CCAs should be to match the Alliance originals?
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Old 04-07-2022, 08:46 PM   #8
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Battery replacement procedure

Quote:
Originally Posted by cspieg View Post
I have a FL chassis. In regards to the chassis batteries, does anyone know what the CCAs should be to match the Alliance originals?


The Alliance chassis batteries I replaced on my 2016 Freightliner DSDP were 1,000 CCA. I attached a photo of the old battery.

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Old 04-08-2022, 06:01 AM   #9
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Thanks Tom.
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Old 04-08-2022, 07:53 AM   #10
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Quote:
Originally Posted by Winemaker2 View Post


On my VTDP Freighliner Chassis the above recommendation holds for house / inverter but interestingly for chassis FL recommends disconnecting NEG first. I questioned this as the chassis batty switch is on Pos but I learned that yhere is a bypass that provides constant power to engine computer.

In addition to pics not a bad idea to ID cables with masking tape and letters / #s and draw a diagram of battys & cables that have letter / #s.
Pics can get confusing where cables cross and terminals not easily identified with each cable.
If all cables are not the same length each having an ID ensures you get them back where they came from instead of trial & error.
In addition to above, as I take them off, I like to use cable zip ties to hold them together.
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Old 04-08-2022, 09:11 AM   #11
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I see lots of good advice above!

First and foremost is to follow manufacturers instructions. Follow coach manufacturers instructions. Follow electronics manufactures instructions. Follow chassis manufacture instructions.

Disconnect shore power, shut down engine, switch off solar and wind controllers. Remove all sources of 12 volt charging.

The general safety rule is to remove the negative cable from the batteries first. This prevents accidental sparking short circuits, blown fuses, tripped circuit breakers, and damaged wires and connectors from a loose hot positive cable. Removing positive first requires careful, disciplined, skilled action.

As added security, I always put a plastic bag over the loose ends to prevent surprises. Wrapping in a shop rag also works.

House battery bank:
However, some electronics including many Magnum inverters require removing the positive 12 volt power from the Magnum first. Removing the large fuse in the Magnum 12 volt cable does this just fine. Then remove the negative cable from the battery bank.

Engine battery bank:
Follow chassis manufacturers instructions. There are lots of different electronic components that have different requirements. Sometimes you need an additional battery connected to support "always on" electronics.

Sometimes the house and chassis battery banks have been "hot wired" together. Verify banks are separate or remove both negatives before proceeding.

Modern systems are highly complicated. Accept some risk of failures during this procedure.

I wish you good luck and happy trails ahead!
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