I used the link from Bob to re-wire my H. I installed a new 6 volt regulator. It was charging continuosly for a while, then stopped charging altogether. The points on the regulator are pretty fryed, and this happened in a really short time. Any ideas on what i did wrong? Also, the light switch had no affect on the system in regards to the low and high charging positions. I know that was designed for a cut out switch, but not sure if should affect a regulator. And, are cut out switches still available?
- Thread starter BTaylor
- Start date
rustyfarmall
Well-known Member
The high/low position on the light switch has no effect on a voltage regulator PROVIDED you used the correct wiring diagram for the voltage regulator, and then you would also need to do some rewiring on the switch itself.
New cut-out relays for the Farmalls are NOT available. At least not anywhere that I know of.
Janicholson
Well-known Member
The light switch is a ground for the F terminal of the generator if there is only a cutout on it. It is a direct ground through the light switch housing (it is not connected in any way to the lighting circuit) in the high charge position. It is through a wire wound resistor for the Low charge position.
This wire should be disconnected all together when a VR is used, as the VR field terminal is the only thing connected to the F terminal of the Gen. Jim
This wire should be disconnected all together when a VR is used, as the VR field terminal is the only thing connected to the F terminal of the Gen. Jim
Janicholson
Well-known Member
If the Generator has a partially shorted field winding, or is a 6v gen being used on 12v it can fry points. If the VR is a new (non original) design, it can have solid state components internally that are polarity specific, and cause issues if used on Positive ground. Jim
Janicholson
Well-known Member
The field coils should have a resistance (from the third brush to the F terminal) of less than 4 ohms, and more than 2.5 (IIRC) if it is out of this range, it will burn points if less, and not charge much if more. Compare the resistance to a known good generator of the same type if possible. There should be no connection to ground on that circuit if the third brush is lifted off of the armature segments with a plastic tab cut from a butter tub or such. Jim
Brownie 450
Member
Like Russ says about the cutout--not available. Always thought a heavy rectifier would accomplish the job in place of the cutout.
gene bender
Well-known Member
Yes you can still get a cut-out they are small like the ones used on ACs. There are two regs made for the I-H charging systems did you have it hooked up for pos gnd it should have been marked. Some of the regs will still use the control for hicharge as i have one and it has worked for at least 25yrs. Maybe you lite control box isnt grounded good as the reg and the gen all need chassis ground which should be pos if you have the correct gen on the H.
If then tractor was started and the genny was polarized incorrectly such that it was opposite from the battery, that can fry relay contact points.
You can use EITHER a Cutout Relay or a Voltage Regulator if wired correct.
You also should use a VR thats correct for your tractor i.e. if its Pos ground then use a VR suitable for Pos ground 0
If its a relay FLD on genny wires to the LHBD light switch but if its a VR FLD wires to the VR NOT to the switch
John T
You can use EITHER a Cutout Relay or a Voltage Regulator if wired correct.
You also should use a VR thats correct for your tractor i.e. if its Pos ground then use a VR suitable for Pos ground 0
If its a relay FLD on genny wires to the LHBD light switch but if its a VR FLD wires to the VR NOT to the switch
John T
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