4th gen vfr 750. clock draining battery.

After overcoming multiple issues with this bike, upgraded to mosfet, engine replaced due to dead cylinder, numerous bulbs out etc. etc. fireblade shock mod, rear hub freed. CBR600 front brake conversion. I went to take it out today after sitting for a week and Yes! the battery was flat. parasitic drain shows 580ma with clock circuit showing as culprit when clock fuse removed,(drops to 0.002ma). apparently the only thing on this circuit is the clock but it works and keeps time perfect. Disconnected mosfet.. no difference, disconnected other fuses with no effect all showing as ok. clock circuit is defo culprit. Can these dash PCB's be bad or go wonky??

 

My 95 can sit for weeks/months and not seem to affect the battery at all.

My ST1100 clock seems to draw more, but I have zero issues over any kind of reasonable time (multiple weeks into months).

Yes, PCB dashes can, and certainly do, go bad and cause problems. Especially on bikes that have not had a "good" life so far.