However, for some models the wiring was slightly different. On most Sportster models, power from the battery positive terminal is sent to the high current terminal of the Starter/Solenoid using heavy gauge wire (for maximum power during starting) and another, lighter gauge, wire from the battery positive terminal is sent to the Main Circuit Breaker. This AC output is fed to the Voltage Regulator (VR) which converts the AC to Direct Current (DC) and limits (regulates) the voltage level of it's DC output. When the engine is running, the Rotor magnets rotate around the coils of the Stator, producing an alternating current (AC) output. The achieved voltage output of the Battery and/or Regulator, under load, will vary according to the existing charge level of the battery, load of the bike circuitry and the Stator output from engine RPMs. Under light load the battery will read 12.5v and under heavy load (starting the engine) it will read 10.5v or more. Refer to your FSM for detailed wiring diagrams, procedures & tests for your specific model.Ī fully charged, good battery, with no load, will show 12.7v - 13v DC when measured on a multimeter. Some model wiring diagrams are in the Sportsterpedia. Although later models have a more complicated distribution scheme, the charging components and operation are functionally the same for all models with alternators (Stator/Rotor). The overview diagram is representative of a typical system and not exact for a specific Sportster model. Voltages are typical with exact values varying under differing circumstances. This description includes the concept that power flows from the most positive source to the lesser positive connection (sometimes thru various devices) and eventually to the negative, ground, point. ![]() For that reason, this explanation ignores the scientific facts of actual electron flow when conceptualizing the charging process, relationships and power distribution. ![]() Note: Most people think of electricity in regards to voltage (as power), with power flowing from positive to negative to complete the circuit.
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