MTD No start

I take that back. Its not the problem. I think theres a short in solonoid or battery cables. I jump the terminal on the solonoid but not hot post to the stud on the starter. All it does is spark. New battery with 12v but acts if its almost dead though.
 
I have 12.38v at the spade terminal on the solonoid. When jumping the soloniod with a screwdriver the engine turns over like the battery is half dead. This a brand new battery bought in beginning April 2012. I have 12.93v on the battery.
 
Replaced the black battery cable and starter and still nothing. I removed the spark plugs and it will spin really fast when jumping the 2 posts on the solonoid but still nothing when using key switch. Bad starter? Bad wiring harness?
 
Took your advice and got a different battery with 340 CCA, 425 CA. The engine spins just fine when jumping the two large posts on the solonoid with the spark plugs back in the engine but still nothing when trying the key switch. Bad wiring harness?
 
Also if jump the battery directly with jumper cables it acts like the battery is half dead when its not. The battery works just fine on the hechinger both have the same 18hp Lhead twin briggs.
 
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