H Farmall Wiring Diagram HELP!

Novice with Case · Jul 6, 2011

I am restoring an H Farmall to the orginal 6 volt positive ground system with all new parts from IH. The tractor came with a voltage regular mounted on the generator. The replacement light switch from IH doesn't have all the extra restistors, etc the old one did. I simply have a pole for a Battery, Front Lights, Rear lights, and 2 poles with a coil running between them. I am not using either of these poles on the switch. The lights work as they should but and the amp hand shows a discharge when turned on with out the tractor running. I have followed the instructions on the generator and voltage regulator in terms of connections and polarizing yet it will not change. Any help would be appreciated!

rustyfarmall · Jul 6, 2011

Here ya go.

http://s101.photobucket.com/albums/m46/farmallbob/Farmall Tractor Wiring Diagrams/

John T · Jul 6, 2011

The LHBD light switch was for older cutout relay systems where the gennys FLD wired up to the switch for Low or High charge. If you have a full fledged Voltage Regulator the gennys FLD wires to the VR NOT the ligth switch, it does lights ONLY not charge regulation.

The VR MUST have a good ground to work.

heres my Troubleshooting procedure

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=665110

John T
John Ts Troubleshooting

Novice with Case · Jul 6, 2011

Thanks for the help guys! I should be able to figure it out now. I will let you know when I get it charging. This is a special project for a friend of mine whose family owned the tractor for years. Driving this old tractor again is on his bucket list. I do not want to disappoint him!

pete 23 · Jul 6, 2011

I will just add that no IH tractor of that vintage came with a voltage regulator mounted on the generator. It was strictly a cutout with an added feature where you could hook hook up the field wire for constant low charge through a resistor right on the cutout. That was for a tractor with starter but no lights so you had no light switch. All voltage regulated H farmalls had the regulator mounted on or near steering wheel post.

SadFarmall · Jul 7, 2011

So far as I am aware, in Australia (and probably the UK) all Farmall tractors fitted with electric starting and/or lighting were fitted with a voltage regulator. Usually a Lucas C39 6 Volt Generator and an RF97 Regulator. The regulator was mounted underneath the generator where it got hot, vibrated a lot and eventually ceased to work.

tractorfacter · Jul 7, 2011

I have a wire diagram for an H but it almost sounds like your voltage regulator is not working.My super A was doing that and a gentlman told me to take the cover off the voltage reg and lightly file or sand the points in there,just as you would breaker points in the dist. If your volt reg. is original, the cover should be screwed on. replacements or after markets can have rivits in that case replace. Also it is not uncommon far a discharge reading with lights on and tha engine at a low idle. Pick up the rpms a bit and see what happens to the meter.uote="Novice with Case"](reply to post at 13:14:41 07/06/11) [/quote]

pete 23 · Jul 8, 2011

It seems I always forget this is a world wide forum. I know IH had factories in other countries and did make things differently there. I was talking tractors built in farmall works in USA. The cutout that looked like a voltage regulator is what confuses so many into thinking they have a regulator. Later years, IH quit supplying the cutout and replaced it with a voltage regulator that did indeed mount on the generator. You could actually just use the cutout portion of it and still use high low charge on light switch if so desired. A lot of after market did have that style regulator that mounted on generator but IH did no use it on factory units. Regulator was mounted else where.

H Farmall Wiring Diagram HELP!

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