The Honda CB750 charging system consists of a battery and alternator that work together to keep your motorcycle's electrical system operating. The alternator consists of two parts, a stator and a rotor. The stator consists of three coils wound around an iron ring. The stator remains stationary while an electromagnetic rotor is spun by engine power inside the iron ring. This action induces the electrical power for the motorcycle. Diagnosing a suspected problem with a stator is a quick and easy job.
- Skill level:
- Moderately Easy
Things you need
- Digital multimeter
Start the engine and bring it up to normal operating temperature. Shut the engine off and remove the left-hand side cover by gently pulling it out of the rubber hold-down grommets.
Disconnect the alternator electrical connector located under the left-hand side cover. The connector can be identified by a single five-wire connector with three yellow, one black and one white wire.
Check for continuity with a digital multimeter between each yellow terminal leading to the alternator. Place one probe of the multimeter to one yellow wire and place the other lead on any of the two remaining wires. The specified resistance between each of the yellow wires is about 0.41 to 0.51 ohms. Replace the stator if any reading between the yellow wires shows no continuity. No continuity indicates a broken winding inside the stator.
Check for continuity between all five wire terminals to ground. Place one lead of the multimeter to a frame ground and place the other lead to each of the five wires in turn. Replace the stator if any of the terminals show continuity to ground. Continuity to ground indicates a shorted wire within the stator.
Reconnect the five-wire connector and replace the left-hand side cover after all repairs have been completed.
Tips and warnings
- Always start any electrical diagnostic check with a fully charged battery.
- Motorcycle exhaust gasses are toxic. Work only in a well-ventilated area.
- Motorcycle exhaust pipes become extremely hot during, and for some time after, engine operation. Contacting the exhaust pipe with exposed skin my cause severe burns.
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