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Ford 9N, 2N & 8N Discussion Forum
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1941 9N coil

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Sam F.

05-09-2007 21:12:52




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Just picked up a 1940 or 41 model 9N. Will it start and run with a 12 volt coil installed using a 6 volt battery ?? I try to start it with the 6 volt battery and it cranks and cranks and doesn't hit a lick. Touch it with a 12 volt battery and instantly it starts and runs. What else could it be ???? Just momentarily touch the jumper cable from the 12 volt battery to the 6 volt battery and BAMM, it starts. Once started it does not need the 12 volt. Got me puzzled. Thanks

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souNdguy

05-10-2007 05:40:39




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 Re: 1941 9N coil in reply to Sam F., 05-09-2007 21:12:52  
I agree with the others.. you most likely have dirty contacts.. burnt points.. bad key switch, etc.. and it is dropping too much V befor ethe coil..

Clean up that wireing and connections and try it.

Clean the ground up as well.

Soundguy



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Sam F.

05-10-2007 07:54:42




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 Re: 1941 9N coil in reply to souNdguy, 05-10-2007 05:40:39  
OK--That is my project for today. New cables, pull the starter out a tad to clean the ground real good, and brighten up all wire connections. Will post results when finished. Thanks



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Dell (WA)

05-09-2007 22:06:45




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 Re: 1941 9N coil in reply to Sam F., 05-09-2007 21:12:52  
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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RP-40-9n

05-09-2007 22:00:57




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 Re: 1941 9N coil in reply to Sam F., 05-09-2007 21:12:52  
sam, you probably have some dirty wireing connections, rust, corrosion etc. or possibly you have low compression, old corroded battery cables is something we all seem to overlook. weak fireing or low compression will both be overcome by the 12 volt jolt. most of the time. RP



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Bob

05-09-2007 21:28:11




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 Re: 1941 9N coil in reply to Sam F., 05-09-2007 21:12:52  
If you intend to keep it "as-original" 6-Volt... get a 6-Volt coil, for Pete's sake!



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Sam F.

05-09-2007 21:32:42




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 Re: 1941 9N coil in reply to Bob, 05-09-2007 21:28:11  
How can I can I tell if it is 6 or 12 volt coil ??? Has no numbers or markings other than FORD logo on top.



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Bob

05-09-2007 22:02:02




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 Re: 1941 9N coil in reply to Sam F., 05-09-2007 21:32:42  
If it has a Ford logo, it is almost certainly a 6-Volt coil.

The so-called "12-Volt" coils are aftermarket parts.



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