I am having a problem with my 81 CSR1000. The battery charging circuit is not keeping the battery charged. I have went through most of the old posts, and from what I can see, the charging circuit is working. I get about 12.5 at idle (1000rpm) and about 13.5 to 14 at around 3000rpm. What I have noticed is the wire that comes from the negative terminal of the battery to the case of the engine (Black/yellow) is getting really hot. Hot enough to melt the rubber around the wire connectors. What I am thinking is either the ground is not sufficient, and maybe I need to make another chassis ground, or I have a short somewhere that is dragging voltage to ground. I did check for a voltage difference between the negative terminal to the battery and the chassis, but it was tiny (Less than 1/8 volt). Resistance readings were all showing good continuity to Chassis and negative battery lead. I have thought about buying a new wiring harness to "shotgun" troubleshoot the problem, but I really don't want to dish out the cash for something that might not be the problem.
Here's what I have currently: 1981 CSR1000, big bore kit, dyna ignition, green dyna coils, vetter fairing, and a new high output battery. I have an OEM voltage regulator for the bike that I got off of ebay, and a new aftermarket regulator. New aftermarket regulator does not have the brown sense wire, just a red and black output going to the red/white and black/yellow wires in the plug/wiring harness, and of course the 3 yellow stator inputs. I get about the same readings with both regulators in the circuit. The aftermarket one gives me about .5 volts more than the OEM.
Any suggestions would be appreciated.