Look up how to do a Voltage drop test.
It's pretty easy and only requires a cheap multimeter.
Start with the cable going from your battery to your ignition switch. And check the positive and earth sides.
If this is beyond your comfort level, then I'm afraid there's not much more you can do beyond what Grant originally advised.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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