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David..... ....a properly done 12 volt conversion, will start your engine in less than 5 seconds at 20 below because 12 volts onnna 6 volt starter motor really spinns. You should get the same performance in July, less than 5 seconds of crankin'. Many 12 volt conversions are done because of HARD STARTING caused by "low engine compression" (Ford spec: 90 psi dry) and the added speed of starter turn-over kinda makes up for low compression. (a bandaid approach) Pull starting your tractor does the same thing, speeds up the engine turn-over. If'n yer been crankin' on your starter motor for more than 1 minute constant, then most likely ya melted the starter gutts and that can cause internal shorts and battery boiling. You asked for suggestions. Do a dreaded compression test. Ford specs: 90 psi min (dry) 5 puffs min and writer down, then 1 squirt of oil down the sparkie hole to evaluate the rings, 5 puffs min and writer down. Good engine will test 100+ dry and 110+ wet. Tired engine will increase +20 psi, wornout engine +30 psi wet. (time to think about engine overhaul) Pull your starter motor for evaluation of comutator solder condition..... ...Dell, a 12 volt advocate for the right reasons
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