| Diagram | Fig. 18 — HEADLAMP, SPEEDOMETER, TACHOMETER · ref 40 |
| Subsystem | electrical |
| Listed in parts books | 1971–1974 |
Bulbholder
Lucas bulbholder used across headlamp, speedo, tach, and flasher lamp assemblies on the bike.
This is a Lucas bulbholder, part number 554548, the small fitting that a bulb seats into before the whole thing is wired into the lamp shell. It shows up in the catalog across headlamp, speedometer, tachometer, and flasher lamp figures, so this is a general-purpose holder Lucas used in more than one lighting or instrument application on the bike.
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If you're chasing a dead light or a flickering instrument bulb, the holder itself is often the culprit before the bulb or the wiring is - contacts corrode, springs weaken, and the bulb loses a good connection. Given how many places this part number turns up in the parts books, it's worth checking the number stamped or listed against your own figure to make sure you're ordering the one for the right lamp.
We don't have more specific detail on wattage, bulb base type, or exact dimensions for this one. Call the shop and we'll help confirm which application you're dealing with before you order.
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