"Nice little gauge, something to check for is make sure the reg/rec has a good ground. It's not a bad idea to run a wire from the ground post of the battery to the mounting screw. Most failures can be trace back to a bad ground. This has been a Suzuki problem since the begining of time."
This just blew me away...I must have overlooked this obvious point when examining the wiring, but I thought all motorcycle batteries were grounded from the neg terminal to the frame? So I take it the solution here is to run a second ground from the negative terminal?
Sorry for the confusion. I detest electrics, unfortunately. And all my problems come from these.