Hi! A am also no expert with anything electric, but my reg/rec killed it self last year and was overcharging the battery. If you dont have a servise manual here is a screen shot of the part where undercharging problems are noted:
If I were you I would first check the most simple thing, that is checking all connections and plugs and than go to the more complex stuff.
Cheers!
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->Honda XL125V Varadero '08 sold
->Kawasaki KLE 500 '05 riding it, like I stole it
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