I have my 300U converted to a 12 volt generator with a voltage regulator and its negative ground. I wanted to keep it close to original and still have a reliable electrical system. Works well for a few years and then problems with the voltage regulator. Every few years the regulator wont allow charging until I tap on it. As time goes it it take more and more tapping until one day it doesn't work and gets replaced. Had that happen a couple of times. Its going down that path again so I'm expecting it to not work at all soon. Is there any thing that could fix it like cleaning contacts or something that needs lubing or should I just plan the funeral and buy a new one now.