As there is a switch on the mount I would not bother finding a switched live to patch into.
In the absence of a multimeter just hook up a headlight bulb, or similar, to two wires and attach to the battery terminals. If the bulb is bright with the ignition on and goes dull with the engine on you know you have a bike problem. If it remains at a constant brightness, all good. If it goes substantially brighter then the generator is possibly generating too much power and your mount is realising that and switching itself off.
Both failure states are potentially problematic for the bike, long term.
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[ Tim | History - NW Italy/French Rivera, Swiss Alps, Morocco | 2016 - Greece > Albania > Macedonia > Kosovo > Montenegro > Bosnia > Slovenia > Austria ]
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