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John Bates' how-to on checking the circuit

HOW TO TEST THE NEUTRAL INDICATOR BULB CKT. WITHOUT A METER.

If you're comfortable working with electricity you'll have no problem with this, otherwise get someone to help who is experienced.

You’ll need a short piece of small gauge wire or a paper clip.

It helps to have an extra pair of hands to: hold the temporary wire connections in place, turn the ignition switch, operate the side stand and move the clutch lever.

If a test fails, it must be fixed before going on to the next test.

Find the diode module. Mine was taped to the wire harness behind the battery (See picture #1).

Remove the tape and you’ll see the small black diode module plugged into a white connector. The white connector has three wires, blue-black (bl-bk), blue (bl) and green (gr). (See picture #2)

Unplug the diode module.

A. To check the neutral indicator bulb and assoc. wiring. 

    1. Turn the ignition switch on while touching the bl-bk wire to the (-) battery terminal.  
    2. The neutral bulb should illuminate.

B. To check the neutral switch and assoc. wiring: 

    1. Turn the ignition switch on while touching the bl-bk wire to the bl wire. 
    2. With the transmission in neutral the neutral bulb should illuminate.  
    3. With the transmission in gear the neutral bulb should be dark.

C. To check the side stand switch and assoc. wiring: 

    1. Turn the ignition switch on while touching the bl-bk wire to the green wire. 
    2. With the side stand down the neutral bulb should be dark.     
    3. With the side stand up the neutral bulb should be illuminated.

D. To check the forward conduction of the diodes: 

    1. Plug the diode module into the connector as shown in picture #3.
    (The end pin of the diode module is inserted into the slot for the bl-bk wire.)



    2.Turn the ignition switch on while touching the middle pin of the diode module to (-) battery terminal.
    3.The neutral bulb should illuminate.
    4.Reverse the diode module and follow 2. and 3. above.

E. To check the reverse blocking of the diodes: 

    1. Plug the diode module into the connecter as shown in picture #4. (The center pin of the diode  module is inserted into the slot for the bl-bk wire and the end pin will be in the slot for the bl wire.)



    2. With the transmission in neutral and the ignition switch turned on the neutral bulb should stay dark.
    3. Reverse the diode module and repeat steps 1 & 2 to test the other diode.