The first thing I'd suspect is the battery. I've seen batteries break battery posts, suffer from internal shorts, and all sorts of problems. You FXR, as well as the Softail bikes, is very tough on batteries. This is due to the fact that the battery is in such close proximity of the hot oil tank subjecting the battery to higher temperatures than other model bikes. Vibration is a contributing factor in the Evolution and earlier bikes as well even if they do have rubber mounted engines. I'd take the battery out and take it to an automotive parts store and ask them if they can "load test" it for you. If the battery test good, you need to check to see if the main circuit breaker is tripping indicating a short circuit somewhere.
Good Luck
Steve
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