New o me 1951 8N questions

John Benware · Sep 3, 2013

Good morning everyone, I just acquired a 1951 8n and have some questions.

I got this tractor on a trade and the gentleman said I would only need to wire a switch for the key. I purchased a toggle switch and hooked up the wires he told me to hook up. One wire comes from the neg. side of the battery (This is a sidemount 6volt pos. ground). The other wire goes directly to the coil. I hooked these up, attempted to jump start, the ractor cranked but the wire from the battery started to melt. The switch burned up. I also noticed this has a 12 volt battery, no ammeter hooked up, VR has wires on it but they don't connect to the generator. I am wondering if it's best to re-wire this thing, or see if there is any other way around the charging system mickey mouse job. Thanks.

souNdguy · Sep 3, 2013

the ignition circuit should be rated to carry 5a continously.. even though in practice it will see less.

Was your toggle switch and wireing rated very low?

If that has a 6v sidemount coil, with no external resistors, and it was run on 12v, then there was more than designed current flowing.

points may have been welded or coil primary shorted.. or some other tomfoolery with the wireing up there causing a short.

i'd pull the genny and see if it passes a motor test. if it does.. I'd be inclined to put her back as 6v positive ground, with a genny.

In the meantime.. check your points and rig up some temporary better wireing and see if you can get her started to judge condition before sinking money into her.

got any spare coils or coils and resistors laying around?

Randy-PA · Sep 3, 2013

Google JMOR wiring diagrams. very good info. My concern is whether your coil is 6v or 12v.
If it were my tractor, I would start from scratch and check or replace all the wiring as needed. Not that big of a job and will save headaches down the road.

ZANE · Sep 3, 2013

It will need a 12 volt alternator if it has a 12 volt battery.

When the alternator is installed you can connect the generator wire to the Battery wire on the original voltage regulator and not have to do any rewiring. Just connect the Gen wire that was on the generator to the positive post on the alternator.

Come off the positive side of the battery to the ignition switch and then to the coil from the switch. If it gets hot when turned on you have a dead short in the ignition wire. Either the wrong wire or it is grounded somewhere before it gets to the coil.

You can remove the wire from the coil and then connect a test light from the positive post of the battery and to the coil wire at the ignition switch and it is lights that indicates a dead short in that wire somewhere. That is if you have the right wire connected to the ignition switch and not something that goes somewhere else.
Zane

New o me 1951 8N questions

John Benware

New User

souNdguy

Well-known Member

Randy-PA

Member

ZANE

Well-known Member

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