| Also known as | 19379 |
| Diagram | Fig. 6 — TIMING COVER, CONTACT BREAKER AND COILS · ref 29 |
| Subsystem | electrical |
| Listed in parts books | 1964–1968 |
IGNITION COIL. Type MA12
Lucas MA12 12-volt ignition coil, large-diameter body, part number 45110.
This is a Lucas MA12 ignition coil, part number 45110, also seen in the books under 19379. It's a 12-volt coil, the larger-diameter MA12 body style, and it turns up in the D.C. Ignition Coils, Horn, Rectifier and Zenith Diode section of the parts catalogs for 1966-1968.
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The coil takes low-voltage current from the points and battery and steps it up to fire the spark plug, so it sits in the ignition circuit alongside the points, condenser, and battery. This large-diameter MA12 style shows up across a range of British twins and singles from this era, not just Triumph, so if you're chasing a replacement it helps to know which coil body size you're actually working with.
We don't have a lot more written down on this one beyond the catalog listing itself. If you're not sure whether your bike takes the MA12 or a different Lucas coil body, give us a call before you order and we'll sort out fitment.
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