| Also known as | MC221 PB |
| Diagram | Fig. 28 — T90 AND T100SS HEADLAMP, WIRING HARNESS AND SWITCHES · ref 15 |
| Subsystem | electrical |
| Listed in parts books | 1964 |
Cloth wiring harness, 6V (1963–65)
Cloth-covered 6V main wiring harness for Triumph twins with headlamp-shell switches, 1963-65.
This is the main wiring harness, cloth-covered, for the 6-volt electrical system Triumph used before switching to 12-volt. The catalog ties it to the T90 and T100SS headlamp/wiring/switch layout as well as a headlamp, wiring, horn and rectifier setup, so it's built around a headlamp shell that carries the switches and instruments rather than a nacelle.
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Running a harness molded for the correct year and system keeps every connection where it belongs — ammeter, lighting switch, ignition switch, horn, rectifier — without splicing in extra wire or guessing at a routing that wasn't original to this electrical layout. This one's cataloged specifically for the 6V cars, so it won't drop into a later 12V bike without rethinking the rest of the charging and lighting circuit.
You'll sometimes see this same harness listed under MC221 PB — that's the alternate part number tied to the same physical harness in our records. If you're not sure whether your bike uses the headlamp-shell switch layout or a nacelle, check before ordering, since the two use different harnesses.
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