any wire coming off the battery should have a fuse, fairly close to the battery, if the wire rubs though somewhere and shorts...a car battery can put out a lot of current! i had a positive battery cable rub against the suspension once, melted the chassis grounds, vaporized the throttle cable, and set one of the rear suspension bushings on fire as we towed the car home.. and also pitted the rear axle bearings causing them to fail 5000 miles later on a long trip...the current went through the bearings since the car body was positive due to the short, and the drive train was still negative grounded through the negative cable for the starter motor.
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