Main ground, unstable voltage
Had trouble with Grom 2015, headlights positive wires for main beam and secondary beam are not stable, volt meter give random readings, at idle 6 or 8volts, when give revs with in seconds readings are: 14, -6, -4 (random crap).
BTW same is rear is 6volts, indicators and dashboard.
*Where is main ground located? please help to find em so I will drop additional and better ground cable to it. Honda mechanic said: there is two main grounds, so would locate them.
*not asking about rectifier as high cost, have to chase cheap fix first .)
Before started this topic I've tried to search on forum
google wiring diagram.