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Old 07-05-2023, 05:35 PM   #1
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Brand: Thor Motor Coach
Model: Tellaro 20K
State: Texas
Posts: 32
THOR #28198
Replacing Balmar Smart Shunt

I'm replacing the Balmar Smart Shunt in my 22 Tellaro on Thor's recommendation. I'm always leary of doing electrical work simply because of my lack of knowledge. Does anyone have any experience with replacing this device? I understand the red wire will be hot but honestly don't know what that means. In my mind "hot" means don't touch. haha.

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Old 07-05-2023, 07:49 PM   #2
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Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,861
THOR #13932
There isn't anything simpler than shunt replacement.
While the shunt is in your hand use it to measure for the right size wrenches/tools.

Take pictures frome very angle before you touch it.
Take pictures as you remove EACH wire.

Take a picture when you're done.
Post it here.
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Old 07-05-2023, 10:49 PM   #3
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Brand: Thor Motor Coach
Model: Tellaro 20L
State: North Carolina
Posts: 279
THOR #26907
Quote:
Originally Posted by JourneyingTurtle View Post
I'm replacing the Balmar Smart Shunt in my 22 Tellaro on Thor's recommendation. I'm always leary of doing electrical work simply because of my lack of knowledge. Does anyone have any experience with replacing this device? I understand the red wire will be hot but honestly don't know what that means. In my mind "hot" means don't touch. haha.
"Hot" in the electrical sense means has a charge of electricity behind it that can shock you or certainly create a bunch of sparks if you touch a ground (metal) object with that positive (red) lead.
If you are able, disconnect the "hot" wire from its source first (battery). I would certainly remove your watch or metal ring on your hand before working with any connections like that and be careful with wrenches/tools etc to not make contact with the positive cable and negative (black) cable at the same time to prevent a free fireworks show...
Curious why Thor recommend its replacement? Mine sometimes needs to be reset but other than that has not been that much of a problem.
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Old 07-07-2023, 11:25 PM   #4
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Brand: Thor Motor Coach
State: Wisconsin
Posts: 222
THOR #27874
I have changed out a bad one...good advice from other posts.

Turn off 12V coach switch. Doesn't actually disconnect the batteries, just the loads and inverter/charger in the coach.

Just be a bit careful, don't let your tools or the loose cables touch anything.

I took a rubber gloves and put over the end of the cables while swapping out the device.

Even if you do touch ground the BMS in the batteries will protect the system, it's that the 'spark' noise you hear that's a bit unnerving.

Good luck
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