Need some help on a Farmall A. I installed a new wire harness and 4 position switch. I have 6v system w/magneto and and voltage regulator. I followed the instructions with the harness and the diagram with the switch but there is a draw on the battery all the time. When the switch is in the 12 o"clock position the headlights are on, one click clockwise no change lights still on low, next click clockwise headlights on high, next click clockwise headlights and rear light on. what am I missing? Is there supose to be a switch to kill power?
- Thread starter Afarmall
- Start date
Janicholson
Well-known Member
This works !!!
The light switch body and stem are a ground for the Field. You have it wired on the switch incorrectly.
There is only one terminal for the Field, and one for the Lights and one for the supply for the lights. There are two resistors. One in the light circuit. (for Low beam) and one in the field circuit for Low charge. With a meter, and all wires off of the switch, but the switch mounted, One terminal will be fully grounded in HDB positions, and have a 2 to 3 ohm resistance (or so) in the L position This is the Field wire terminal only. The other terminals will read zero resistance from battery input screw to light output when in H only. The same terminals will have about 2 ohms when in the D position. I hope this clears up the situation. This is the second time in two days to use this post! Jim.
The light switch body and stem are a ground for the Field. You have it wired on the switch incorrectly.
There is only one terminal for the Field, and one for the Lights and one for the supply for the lights. There are two resistors. One in the light circuit. (for Low beam) and one in the field circuit for Low charge. With a meter, and all wires off of the switch, but the switch mounted, One terminal will be fully grounded in HDB positions, and have a 2 to 3 ohm resistance (or so) in the L position This is the Field wire terminal only. The other terminals will read zero resistance from battery input screw to light output when in H only. The same terminals will have about 2 ohms when in the D position. I hope this clears up the situation. This is the second time in two days to use this post! Jim.
Janicholson
Well-known Member
There is no Voltage regulator on the tractor. (If you have one on it, there should be no connection to the light switch at all). The use of the light switch connection is only if the generator is not equipped with a voltage regulator. The L and H positions control the gen output. (I assume the tractor has no real VR, just a cutout relay)
There is no resistor between the terminals you describe. Those terminals have no internal or external connection at all. The generator F terminal is connected to ground through a resistor "L", or directly to ground through the switch body in "H" position, and D position and B position. Jim
There is no resistor between the terminals you describe. Those terminals have no internal or external connection at all. The generator F terminal is connected to ground through a resistor "L", or directly to ground through the switch body in "H" position, and D position and B position. Jim
Janicholson
Well-known Member
There is no Voltage regulator on the tractor. (If you have one on it, there should be no connection to the light switch at all). The use of the light switch connection is only if the generator is not equipped with a voltage regulator. The L and H positions control the gen output. (I assume the tractor has no real VR, just a cutout relay)
There is no resistor between the terminals you describe. Those terminals have no internal or external connection at all. The generator F terminal is connected to ground through a resistor "L" to ground through the switch body, or directly to ground through the switch body in "H" position, and "D" position and "B" position. Jim
There is no resistor between the terminals you describe. Those terminals have no internal or external connection at all. The generator F terminal is connected to ground through a resistor "L" to ground through the switch body, or directly to ground through the switch body in "H" position, and "D" position and "B" position. Jim
Janicholson
Well-known Member
I now have enough information to fix the problem!
The 4 position switch is not correct for a voltage regulator system. (by the way some Cutout relays had the same box as a VR, and 3 wires as well!) If yours is a new VR, here is the scoop::
Do not use the terminal labeled Voltage regulator.
connect the F terminal of the VR to the F terminal of the Generator directly. The F terminal is the smaller of the two on the gen.
Connect the Bat lead of the VR to the amp gauge (opposite the lead that goes to the starting switch.) Connect the Arm, or GEN terminal of the VR to the Arm terminal of the Gen. (bigger gen terminal)
The Remaining terminals are just fine. Power in to the same side of the Amp gauge as the Bat wire from the VR.
Tail light, and headlight. are good to go.
The switch will have 2 OFF positions far CCW, and the next position CW from there. D and B should be fine for the lights. Jim
The 4 position switch is not correct for a voltage regulator system. (by the way some Cutout relays had the same box as a VR, and 3 wires as well!) If yours is a new VR, here is the scoop::
Do not use the terminal labeled Voltage regulator.
connect the F terminal of the VR to the F terminal of the Generator directly. The F terminal is the smaller of the two on the gen.
Connect the Bat lead of the VR to the amp gauge (opposite the lead that goes to the starting switch.) Connect the Arm, or GEN terminal of the VR to the Arm terminal of the Gen. (bigger gen terminal)
The Remaining terminals are just fine. Power in to the same side of the Amp gauge as the Bat wire from the VR.
Tail light, and headlight. are good to go.
The switch will have 2 OFF positions far CCW, and the next position CW from there. D and B should be fine for the lights. Jim
Removed the voltage reg. connection and put it on the dead unmarked terminal and everything works the same as when the wire is not connected to anything.Top position is nothing, first position cw is low headlights, second cw is high headlights and last cw is all lights. Wiring diagram that comes with the switch is wrong. Do not use the voltage reg. connection. Thanks for all the help.
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