| Diagram | Fig. 33 — HEADLAMP, WIRING HARNESS, SWITCHES AND TAIL LAMP · ref 42 |
| Subsystem | electrical |
| Listed in parts books | 1964–1974 |
Bulb (offset pin) (99-0542)
Offset-pin dual-filament tail lamp bulb (PN 380), the stop/tail bulb fitted in the rear lamp assembly.
This is the bulb Ed's counter stocks for the tail lamp, an offset-pin dual-filament bulb that carries both the brake/stop element and the running light in one unit. It's the small item that lives at the back of the bike, inside the tail lamp lens, and it's the same bulb referenced across the wiring, tail lamp, and rear fender parts-book figures over a long run of years in these catalogs.
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The offset pin is what keeps orientation correct when the bulb is seated in its holder - it's not a bulb you can put in backwards or upside down without it either not seating right or lighting the wrong filament at the wrong time. It shows up under two catalog numbers, 380 and 392-380, and across a wide spread of tail lamp and rear fender assemblies from the mid-60s through the mid-70s in these listings.
It's a wear item, the kind of thing worth having a spare of in the tool roll since a blown tail bulb is an easy roadside failure to have and an easy one to avoid if you keep one on hand.
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