[Tassie f100]

Originally Posted by .:4:.

I bought one of those small lithium jumper packs, the ones that fit in your glovebox. My old lead acid one never really lived up to its claims. But this lithium works heaps better. So my boats batteries are dead completely and even hooked up to a car, being this dead, its notoriously slow to turn. So battery selector set to battery 2, hooked up the jumper pack, it turned over perfectly. I wasnt starting it, its bone dry in the fuel department anyway, i just wanted to get the oil flowing inside the motor. Its a pretty big capacity engine for a 5.3m boat. Its a 4.3L v6, and it has 2 x 730cca deep cycle marine batteries, but this little 900a jump pack performed very well. I like it.

Did you hook up the water to the stern drive?If not you may have destroyed the water pump impeller