First thoughts are that it sounds like either a shorted wire somewhere or a failed ECM... so far. Don't buy any parts yet tho, until you've got some proof to lean on. As for finding the problem that might take a considerable amount of time. I would look at the service manual wiring diagram for clues and be unplugging things one at a time and checking circuits & switches with a multimeter until the fault can be isolated.
My first question would be: Are there any non-OEM Honda electrical parts on the bike? If so, remove those and test again. If not, begin by testing high current drawing components first.
Check the shift switches too... neutral, reverse, auto/drive, etc. Also check the charging system output in case the regulator/rectifier might be spitting out high, AC-laced charging voltage. Max charging voltage should be about 14.5 - 14.7 volts DC revved up.
Is the battery in good condition? Clean terminals and grounds?
EDIT: Also be on the lookout for an internally corroded/melted wiring harness connector. Scrutinize the condition of the fuse box sockets as well.
My first question would be: Are there any non-OEM Honda electrical parts on the bike? If so, remove those and test again. If not, begin by testing high current drawing components first.
Check the shift switches too... neutral, reverse, auto/drive, etc. Also check the charging system output in case the regulator/rectifier might be spitting out high, AC-laced charging voltage. Max charging voltage should be about 14.5 - 14.7 volts DC revved up.
Is the battery in good condition? Clean terminals and grounds?
EDIT: Also be on the lookout for an internally corroded/melted wiring harness connector. Scrutinize the condition of the fuse box sockets as well.
