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Like so many other things, the Ford electrical system is just that - a system. You have made a significant change to one part of the system - i.e. the load placed on the battery & generator. Given that the old systems were pretty much at capacity, you may be looking at putting on a larger generator or changing to an alternator to enable the power output to keep up with the new demand. Gotta maintain the system's equilebriumin order to get proper performance. FWIW.