While running it is supposed to be at 14.4 volts correct? If the breaker is closed, what would the voltage read? This test to see if the breaker is "closed" is to measure voltage at the battery when the bike is running. Also in my signature you can see that I have my bike with is a 1999 FLSTF. A simple test to determine if the breaker is "Closed" is to measure the voltage at the battery when the bike is running.I posted the electrical wiring diagram on the first page which states it is a 50 amp circuit breaker not 30. When the bike is running, voltage from the regulator passes through the breaker and leads back to the battery charging it. On the other terminal is a wire leading to the starter where it connects with the positive battery terminal cable. Two wires are connected to one terminal of the breaker (Regulator output and Ignition Switch). A simple test to determine if the breaker is "Closed" is to measure the voltage at the battery when the bike is running. In 07 Harley eliminated this breaker and replaced it with a 40 amp Maxi Fuse. I replace mine every 2 years and carry a spare in my saddlebag. These breakers are not water tight and often corrode. Once the metal cools, contact is again made. The bending of this metal breaks the circuit. Inside these breakers is a thin metal strip that bends due to heat when excessive amps are passed through it. Should the starter fail, the breaker would prevent excessive amps from transferring into the electrical system. The starter draws massive amps from the battery. The breaker you're looking at is 30 amps and serves only one purpose. You neglected to state year, model and if your running EFI however I can determine that your bike is 06 or earlier.
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