Charge system test
Start the engine and rev it up to 6000 rpm.
Measure DC voltage across battery terminals using a multimeter set to the DC voltage scale.
Switch on the low beam lights.
Correct voltage reading is 13.5 to 15 Volts.
Troubleshooting
Check the condition of the 20A fuse.
Check the connections of flywheel, regulator and fuse leads.
Check the flywheel.
Check the battery; see 8.3.1.
Replace the regulator with one known to work properly.