They should be connected to the battery via a relay. A relay is a remote switch. Very cheap at auto place like repco. It caries the high current directly to the controller.
It has a sense wire that energizes when the ignition switch is turned on. Connect it to something that gets power when switch is on. Like the feed to the rear brake light switch. (One side of that switch will have power all the time the other only when you brake). That turns the relay on.
This isolates the current draw from anything critical and should solve your problem.
The only other question that is near the top of the list, is does the alternator has enough output to feed the grips?
When set up as above connect a multimeter to the battery and rev it up. Then turn the grips on. It shouldn't change much. It could be though that the output is minimal at idle and the extra draw sags the voltage. But if it is enough to charge a battery for electric start you'd think it wasn't that marginal.
Go to an auto electrician.
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