Where the location might be is hard to call. There shouldn't be anywhere the wires would rub to create a bare spot and ground itself out. If the wires got too hot for some reason, it could have melted the covering and ground itself. Have to take into account if the previous owner was nosing around and pinched a wire somewhere. Do you know whether there was a aftermarket alarm put on it. The reason I ask is they could have tapped into the wiring for the lights to come on when they disarmed the system and when they took it out, didn't put good protectin on the wires or left them bare and be grounding out that way. There is a ton of things that have could have happened, but the only real way to find out is start at one end(perferably the easiest to get to) and trace the wires to the other end. Looking for any bare spots. A loose connection shouldn't cause a fuse to blow, lights would only work when they wanted to. Let me know what you find.

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97 GTP~K&N Cold Air Intake~3.4" S/C Pulley~Cat Back Exhaust~MSD Blaster Coil Packs~MSD 8.5mm Wires~NGK TR55IX Plugs~More To Come