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Message: <blockquote data-quote="duanebro" data-source="post: 7527229" data-attributes="member: 636988">You are protecting against shorts. Short your batt + to ground without and your car "could" burn up! If you change wire gauge you must fuse again due to the smaller wire not being able to handle as many amps. You must use the right fuse for the wire gauge - a smaller fuse is fine if you are not using that much current.In your example I'd use a 150 amp fuse.I have seen burnt wires because someone used a small whip to connect a stove where I worked. The breaker never tripped, but the wires were gone!</blockquote>

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