Some dummy (ME) crossed wires on the battery charger this past winter. The tach still works and it is running good but the battery goes down after a couple of trips to the lake. Charge her up and let her set for a month and she stays charged so I assume the battery is OK. Run her a time or two and down goes the battery. Would the tach still work if I had smoked the rectifier/voltage regulator? Thanks for any help.