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you need a switch on the either the positive or negative wire to the contactor or else it will be powered on at all times. a key switch or even a toggle switch rated at least 10 amps should work. SPST
Later floyd
 

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No when you get into gokart you "start the gokart" turn on the switch the switch is on after that till you turn it off. The controller should have throttle connection s marked grd, 5+, hall/speed
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or it has a matching conector to this style of connector
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. or it may be more complex I haven't a clue to more complex throttles. ignore the brake switch just speed ground, speed and +5v are needed once you have it working then if your throttle has a brake switch you can worry about it.
Later floyd
 
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