If you're ever going to disconnect a battery, always pull the ground first. Therefore, I'd switch the ground.
Why do you want to switch it? 20 amps would probably do, but I'd go as big as possible / practical.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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