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You don’t identify the engine – SRL xxx ? However back in the day many of the MAGs fitted to Mastiffs etc were equipped for electric start or lighting even though that wasn’t fitted. So, as you say coils – in the plural, you probably have a surplus charging coil.
Identify the ignition coil with the HT plug lead and probably a single primary coil wire going to the points where it will probably share a common terminal with the condenser / capacitor and maybe a kill wire going to an on/off switch on the handle bar. Memory says that the internal wires are often taken to a terminal block on the outside of the engine cowling.
If it will help, I can possibly find a wiring diagram but it will assist if you can supply the SRL number.