I am new to this forum and also boat maintenance. I own a 1985 Evinrude 120hp. I think they call it a looper. It is a 4 cyl. My tach does not work, and I made sure it had power going to it with switch on, and it does. I also seem to have to recharge my batteries more oftem than my buddy, usually after two trips and its nearly dead, and wont start my motor. I heard this is the rectifier that is bad. Where is the darn thing located on this motor, please help.