controller for 2 motors

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adr826

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I recently built a scooter and added an extra motor to it. It now has 2 750 watt motors connected in parallel running off of 2 12 volt 21ah lead acid batteries. I run the whole thing off of a homemade switch I attached to a brake cable. Its very fun and goes about 20 mph. I'd like to switch it over to a regular controller with a throttle but the first throttle I put on it burnt out after a week. My guess is too much current running through the two motors to handle. How can I figure out which controller is the right size for the scooter given that it has 2 motors and nothing I've read covers this. Also what would be the likely difference between running the motors in series and as they are now in parallel? Thanks
 
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