Would a broken capacitor cause the vesc to cut out under acceleration

and would a cheap toggle switch for on off cause my vesc to cut out under acceleration?

If your using just a cheap toggle switch to power on and off, there will be extreme arc damage inside the switch that can cause intermittent interruption of current flow and eventually complete failure. I experienced the same thing using an automotive breaker switch.

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You need either to make a loop key with an anti-spark connector or buy an anti-spark E-switch. http://www.electric-skateboard.builders/t/how-to-anti-spark-xt-90-loop-key/204

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