He has a regulator without the sense wire but good idea anyway. I have discovered the black sense wire doesn't need to be switched, it draws no power from the battery.I just went through this with my 1984 GL 1200I. With the key on, check your battery voltage first, then check the voltage on the regulator sensor wire (black wire) using the ground side of the battery. If they are the same the sensor wire is good. If the sensor wire is more than 1/2 volt off the regulator is pushing the charging voltage up based on what the sensor wire says and is over charging based on the difference. Mine was 1 volt lower and it was charging the battery at 15.3v. There are different ways to correct this but I chose to re-route the sensor wire to the battery. It is now charging at 13.4v.