I’m not sure if it matters. If you have an S one laying around I’d try that just to be extra safe.
https://www.electric-skateboard.builders/t/no-words-just-pictures-delete-words-use-pm/2992/8852
U can also double click the drag handle and it’ll auto find end of range and fill. Cntl+D good too
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@Battosaii the male doesn’t matter but the female has to be an “S” variant.
Would you photograph your setup and how the battery is/was connected to everything else?
Are you sure you weren’t shorting the battery out?
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I had this problem once and ended up destroying my VESC
Doubled checked everything and there was no reverse polarity or wires exposed was just random.
Maybe a faulty or fake XT 90 S?
Definitely looks like a short and though it pains me to say it because hes been picking on me lately,
I think hes right on the money 
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Beautiful Build
What wheel pulleys are you using?
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That was build over 2 months ago haha. Just posted pictures of my recent updates on the build 
Wheel pulleys And motor mounts are torqueboard’s!
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I thought I recognized the build 
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No shorts I checked everything also this set up has been tested and ridden before the only difference was the new loop key set up I plugged in.
Do you have a photo of everything as it was when you plugged-in the loopkey? Or any photo of how things were connected?
I think the real question people should be discussing is how to prevent something like this from happening in the future; not only for you, but others as well. Was your cutoff voltage set too high? Or did you somehow have a massive voltage sag occur? When my board is about to run out of power I can’t even go that fast (or fast at all), and when it does cut out it’s in free-roll mode, so it doesn’t suddenly lock up or anything.
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I am not entirely sure yet.
I am thinking MBS, etoxx gear drive 6380 motors 12s…top mount.
Open to suggestions.
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Sounds like a great plan.
I like top mount, that’s new for you?
Lipos or 18650s?
What etoxx gear ratio?
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Gotta build and learn to ride this thing by Thunder in the mountains!
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Helical don’t know which gearing yet
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Yes it is. New to MTB.
I was thinking two 18650 batts that are quick removable to have good range but keep it a little lighter?
I want to do like a picatinny rail system and clamps on the bottom of the battery boxes.
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I have everything taken apart right now. But I did test with my TB12s4p and it turned on like normal no shorts in the set up, the Master Focbox failed, I’m in the process of checking the fault code, it has a red light constant blinking. I’m hoping it was just the drv that blew. I don’t smell any burned electronics. The other 3 Focbox don’t have red lights but I can’t test them till I hook them up to the PC one by one cause they are all set up as slaves.
Kinda sad now cause single Focbox are no longer available. 
I hope it’s fixable.
Nice!!! How much did it cost? Do you have a link to a shop selling this? Is their online shop up now?