Important Points to Keep in Mind When Maintaining a Generator!

(1) The JF series AC generators are negative-grounded; the battery’s ground terminal must have the same polarity as the generator. Otherwise, the battery will discharge through the diode, causing the diode to burn out immediately. When connecting the battery, the positive terminal is typically connected first, followed by the ground wire.

(2) While the generator is running, do not use the spark test method to check whether the generator is producing electricity, as this can easily damage the diode.

(3) When the engine is not running, the ignition switch must be turned off. Otherwise, battery current will periodically flow through the field winding and the regulator’s field coil, burning out the coils.

(4) The wiring between the alternator and the battery must be securely connected; if it is suddenly disconnected, an excessive voltage will be generated, which can easily damage the diodes.

(5) If the generator malfunctions (fails to generate electricity or produces very little charging current), inspect it promptly; do not allow it to continue operating for an extended period, as this may cause damage to other diodes or the stator windings.

(6) When the six silicon diodes of the rectifier are connected to the stator windings, it is strictly prohibited to use a megohmmeter or a 220V AC power source to check the generator’s insulation; doing so may cause the diodes to break down and become damaged.

(7) Keep the surface of the generator clean and ensure proper ventilation; maintain the drive belt at the correct tension (when pressing down on the drive belt with a force of 98 N, the deflection should be approximately 9–11 mm).