Neutral Switch
Some manual transmissions were fitted with an electrical Neutral Switch to signal when the gearbox is not in gear. Automatic Transmissions are fitted with a an Inhibitor Switch which also signals when the automatic is in Neutral.
Overview
Neutral Switch was first used in 1973 USA models.
Neutral Switch was used for:
* EGR (some years e.g. 1990 1200, 1975 B210) * Fuel Shut-Off System on B310 * Starter interlock on automatic cars * Throttle Opener used the Inhibitor Switch to detect neutral * TCVAS spark control used the Top Switch to detect neutral
Location
56-Series Transmission Neutral Switch
is near top of 4-speed
56-series Neutral Switch (yellow arrows) 
60-Series Transmission Top Switch
on the tail extension, near top
Tail Housing, near top, above (T)op and (R)everse and switches
Part Numbers
Also See: * Inhibitor Switch for automatics * 63-Series_Transmission#Switches
32130, 32006
32005-21101 SWITCH ASSY-REVERSE LAMP 32006-G6200 NEUTRAL POSITION SWITCH
B310 USA A12 56-series 4-speed * 32005-H5000 SWITCH COMP-REVERSE LAMP <> 32005-K1201 <> 32005-K1202 * 32006-K2400 SWITCH COMP-NEUTRAL <> 32006-K2401 CAL 0879- * 32006-K2000 SWITCH COMP-4TH <> 32006-D0120 <> 32006-D0102 A14/A15 60-series 4-speed * Reverse same as 56-series 4-speed * Neutral same as 56-series CAL 0879- CAN * SWITCH COMP-TOP (0879-) - same as 56-series FED, CAN A14/A15 FS5W60L & FS5W60A 32005-K1000 SWITCH COMP-REVERSE LAMP <> 32005-K1001 <> 32005-K1002 32005-H5000 SWITCH COMP-REVERSE LAMP <> 32005-K1201 <> 32005-K1202 32006-D0102 SWITCH COMP-TOP <> 32006-D0120 32006-K2000 SWITCH COMP-TOP 32130-H9000 32130-H9010 32130-H9705 32006-K2400 SWITCH COMP-NEUTRAL <> 32006-K2401 CAL COUPE
NOTE: Sometimes misspelled as 'Nuetral Switch'
¤