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Andy,
I think if you look, you are likely to find some other reason for the failure. The 129 amps at stall is not enough to kill a contoller by itself and the breakers are sufficient protection for the controller. High on my list is failed motor brush assembly, hardware across the circuitry feeding the motor, or metal flakes in the speed controller. All of these have the potential for exceedingly high currents at the speed controller.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.
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