Ok let's say that the positive side of the wire going to your V1 somehow gets in contact with any metal on your car (grounded). This could happen by it becoming fraid, or a connector coming loose etc.. this will create a short circuit. In a short circuit condition, the amperage will not be limited by anything and will cause wire to heat up and melt the metal and jacket.
One of the main purposes of automotive fuses is to blow in the event this happens. Now.. if that wire you put in there is on the wrong side of that fuse.. you basically have no fuse (automatic shut-off system) in place making it dangerous to your cars electrical system.
Maybe someone else on here can remind me which side is hot in that fusebox, the top or bottom.. I'm too lazy to go test it right now.
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Jay
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