yes I do know that I tried the diode both ways and when you reverse it the machine would not shut off. I ran more tests today and found when the guy who owns the machine he put the small wire on the wrong post I found that there was only 7.11 volts going through the diode the checked the power at the alt and the post feeding the diode side was on the wrong post. Changed post and now its working fine. thanks for the helpIs it possible you have diode installed reversed?