| Also known as | MC204PB |
| Diagram | Fig. 25 — ELECTRICAL EQUIPMENT · ref 19 |
| Listed in parts books | 1963–1964 |
HARNESS 1962-67 T20M ET ENERGY TRANSFER AC
Wiring harness for the 1962-67 Triumph T20M Cub energy transfer (AC magneto) ignition system.
This is the wiring harness for the T20 Cub built with the energy transfer (ET) ignition system, the AC magneto-based setup Triumph used on these small twins before coil ignition came in. The catalog lists it for the 1962-67 span of T20M Cub production. If your parts book still shows the old MC204PB number, that's the same harness under its earlier reference.
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Energy transfer bikes run their lighting and ignition off AC current straight from the magneto/alternator, without a battery doing the heavy lifting the way a standard coil-ignition harness setup does, so this harness is wired specifically for that arrangement rather than a generic Cub loom. If you're not sure whether your Cub is set up for ET or for coil ignition, check before ordering since the two harnesses aren't the same part.
We don't have much more detail on this one beyond what's in the catalog record. Give the shop a call with your frame and engine numbers handy and we can help make sure this is the right harness before it ships.
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