I am 100% sure the connections at the tach are correct and fixed now. I verified them 20 times with the meter, as I have with the two rectifiers. I tested the new one I bought before installation by the omc service manual (test ground lead to case of rectifer, then test each wire to get a reading. Then reverse test to get no reading in another direction - now after its blown, I get readings in both directions), to be sue it was working, in case i needed to exchange it. This leads me to believe I either have a faulty stator, or a reason the rectifier has blown after just 20 minutes. I ordered 2 more new rectifiers, and will sacrifice one if I need to, and test it after tightening all connections. Is it true that the tach will read the pulses off the stator, which means It should run properly off the yellow wire from the stator? The tach still reads erratically hooked to the yellow stator teminal (not bouncing like its losing power, but dropping, rising fast, etc like its losing its signal). This is on the switched ignition plug AND directly hooked to the battey.