Sam..... ...coils are funny, just like light bulbs, would you try to light one of your car 12-v headlites with 110v from your house??? Or would you try to light yer house lite with yer 12-volt car battery??? You ask..... ."Will it start and run with a 12 volt coil installed using a 6 volt battery ??"..... .have you figgered out the answer yet??? NEVER....EVER....JUMP 12-volts TO YER 6-volt BATTERY terminals 'cuz it will EXPLODE and BOIL BATTERY ACID into yer face and eyeballs. NOT a pleasant sight. Iff'n your needing a 12-volt boost to start yer engine, go DIRECT to yer starter MOTOR stud, make certain your tranny is in NEUTRAL. UNDERSTAND??? It doesn't hurt yer 6-volt starter to gitt a 12-volt boost. When a 6-volt tractor cranks'n'cranks and donnna start, its time to quote the 6-volt MANTRA: "keep'em clean; and brite'n'tite". CLEAN yer battery posts shiny brite and change yer battery cables. Why? 'cuz they gitt internal corrosion inside the molded clamp that you cannot get-out. New one-ought (1/0) thick as yer thumb battery cable $10 (cheap) then replace yer rusty sheetmetal flat-braid ground cable with 11-in long flat-braid bolted to one of yer castiron steering gearcover bolts. And finally, loosen yer 8"-long stater bolts so you have about 1/4" gap between starter endplate and tranny housing hole and WIRE-BRUSH the heck outta the gap. This will make yer 6-volt starter zing on 6-volts. A faster turning engine is always eazier to start. (as you have found out) You may have "other-issues" but do the BATTERY stuff first..... ...Dell, yer self-appointed sparkie-meister
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