Starting briggs 440000
Hello, I'm having trouble starting my Briggs & Stratton 440000 engine on my tractor. I have the battery on full charge, past 13 volts on multimeter. Yet when I try a normal crank it fails to start. The only way I can crank her is when the battery is on full charge and I jump her with a positive clamp right on the 12v electrical starters bolt. The battery is new and is only one season old, no lead sulfate condition inside the battery, that I know of. I've tried two other car batteries and they've failed to crank the engine as well. I've checked all the wiring too. Is it the starter that needs to be replaced. If so, is this difficult to replace?