| I am guessing that you mean on the street. If he is blowing a fuse he probably has a short ( intermittent due to vibration? Perhaps melted harness?). I would try to work backwards from the blown fuse checking continuity with an ohmeter and looking for signs of physical damage on the harness. I would also double check the quality (joint and insulation) of any recently added connections (boost solenoid, AEM, gauges, battery cables). That is where I would start anyways based on your short description. Hope this helps.
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