Join Date: Aug 2009
Location: Silver Spring, Maryland, USA
Make: BSA Royal Star
GL1500 Neutral Light Bulb
I have read a lot about "No Neutral Light"
This might help someone understand how the neutral light circuit works.
GL1500 Neutral Light Circuit (1990 - 2000)
The reverse/start “5-amp” fuse provides input voltage “brown/white” wire to the reverse lever switch.
The reverse lever switch (when the reverse handle is down) provides input voltage “black/white” wire to the neutral light bulb.
This wire passes through 3 connectors:
1. 3-pin red connector behind the left fairing inner cover. (Near the reverse lever switch)
2. 14-pin black connector behind the left fairing lower cover. (Near the left radiator fan shroud)
3. 20-pin white connector behind the instrument panel.
The gear position “sensor” switch (when the transmission is in neutral) provides a ground “light green/red” wire through the reverse diode assembly to the neutral light bulb.
This wire passes through 5 connectors:
1. 20-pin white connector behind the instrument panel.
2. 14-pin white connector under the trunk.
3. 22-pin red connector under the seat.
4. 13-pin white connector at the rear of the right fairing pocket. (Behind the air compressor controls)
5. 6-pin black connector on the right radiator fan shroud.
Now you have a neutal light.................!!
Note 1: The neutral light is not part of the starting circuit. It is only a convience to let folks kmow the
transmission is in neutral. If the bulb was burned out, the bike would still start.
Note 2: The reverse lever switch also provides input voltage “black/white” wire through the reverse
diode assembly to activate “trigger” the reverse relay switch (which provides a ground to
activate “trigger” the starter relay A).
You could have a neutral light (which would indicate the reverse lever switch was good) and still have a starting issue if there was a faulty reverse
diode assembly or reverse relay switch (or other “ground” inputs to the reverse relay switch).
Are you confused yet.....??