| Diagram | Fig. 18 — HEADLAMP, SPEEDOMETER, TACHOMETER · ref 9 |
| Subsystem | electrical |
| Listed in parts books | 1969–1974 |
Sealing washer
A small rubber sealing washer used at headlamp, warning light, and instrument fittings to keep moisture out of the housing.
This is a small sealing washer, part number 54140331 (also listed as 5288T167), that shows up over and over in the electrical sections of the parts books - headlamp assemblies, warning lights, switch panels, and tail lamp fittings. It's the kind of washer that keeps water and grit out of a lamp housing or a warning light fitting where a wire or bulb holder passes through the shell.
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Given how many different figures it turns up in - headlamp shells, speedo and tach mounts, warning light panels, wiring harness and switch assemblies across a run of electrical equipment plates - it's clearly a common seal used at several points in the lighting and instrument wiring rather than a one-off. The catalog doesn't spell out exact rubber compound or size, but the job is consistent: sealing a fitting into a lamp or panel body.
It's cheap enough that most folks buy a few at a time rather than order just one when they're refreshing a headlamp shell or warning light setup. If you're chasing down a damp electrical connector or a warning light that's let moisture in, this washer is worth checking and replacing while you're in there.
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