| Also known as | WW19120C |
| Diagram | Fig. 34 — HEADLAMP, WIRING HARNESS, SWITCHES AND TAIL LAMP · ref 26 |
| Subsystem | electrical |
| Listed in parts books | 1966 |
HARNESS,CLOTH 66 T100/120
Cloth-covered main wiring harness cataloged for 1966 T100/T120 Triumphs, PN 54938941.
This is the main wiring harness listed in the books as 54938941, cataloged as a cloth-covered harness for 1966 T100/T120 machines. It's also cross-referenced under the older Lucas-style number WW19120C, which is how it would show up if you're working from an earlier parts list.
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A harness like this is the wiring backbone of the bike, running from the headlamp shell back through the frame to carry current to the ignition, lighting, and charging circuits. Getting the correct harness for your year matters because connector types, switch wiring, and circuit routing changed from one season to the next - a harness built for the wrong year can leave you improvising splices and jumpers to make things line up.
We don't have extra detail behind this one beyond the catalog listing itself, so if you're not sure this is the exact harness your bike needs, give us a call before you order and we'll help confirm it.
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