Etec 130 or 150 for 20 ft Master angler

[Bushwacker]

I don't know what standards the outboard makers design to, but that would be a good question to ask the factory engineers if you can find any at a boat show! My only point was that use of nylock nuts instead of wingnuts on the battery terminals is good practice, and I would do that regardless of what brand of motor was on the boat.