Originally Posted by Webby
Welcome to the forum
Have a look at this thread, there are a couple of links that include wiring diagrams of the 2MC capacitor you describe.
If you intend running the bike with a battery you don't really need it.
I hope this helps
Webby is correct, a 12v source makes it redundant, however, what happens when the 12v source is not available? For most owners, its a call home for the pick up truck.
I'd suggest you place the 2MC on a circuit with an isolating switch. This leaves the capacitor "dormant" when the battery is good, and then with a flick of the switch you'll have ignition power when that battery dies on you away from home. RR