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H - Janicholson

Interesting and expected. Now disconnect the F terminal on the VR. Measure resistance from ground to terminal if near or at infinity (not zero 0) the regulator is not working. The generator is grounded to the frame of the tractor. The armature is grounded to the tractor through the grounded brush. The non grounded brushes are grounded through the armature windings and though they have a little resistance, they have not enough to read on a ohm meter unless it is very sensitive. The field voltage source is connected to the third brush, and will test grounded with a meter. the field windings also have resistance, but won't show on a meter. so with all wires in place, the entire field circuit will appear grounded, and it did. Everything is pointing to a bad or non grounded regulator. Jim
 
I know the regulator is new. They are often non functional out of the box. What brand is it? Delco Remy? Jim
 
pic...ill get the reading.
a169430.jpg
 
Gen Field to VR Field(wire unhooked) 0.01
Batt V at regulator is 6.5

Also- I thought the ARM post on Genny should be hot when running?

VR brand just says ( positive ground) no name- Im sure I bought the cheapest on Ebay. Have to run in town...be back.
 
In the above post I asked you to measure the resistance of the wire (wires and connections to terminals on the wires go bad. An ohm meter reading is not very good at doing what you need to do next.

With it running 2/3 throttle and all wires connected, put the volt meter (with the red wire grounded) and the black wire on the F terminal of the VR. It should read nothing or very little. If it reads more than 6 volts, the regulator is bad. Get a better one From NAPA, or other national USA made VR. Jim
 
okay.....with everything hooked up - tractor running half throttle- with Volt Meter- ground red lead to frame and black lead to Field terminal on VR - 0.2 volts. Touch black lead to "batt terminal " on VR it reads 8.2 volts; go around to battery it reads 6.5 volts. :)
 
That means there is too much resistance between the VR Bat terminal and the battery. Voltage is being lowered by the undesired resistance.
Could be a bad ammeter or bad wire somewhere in the path between battery and VR Bat terminal. As Jim said wires and wire terminals are suspect to failure as well as other items.
 
The wiring from the VR to the amp meter, or from the amp meter to the battery (less likely) is bad that wire needs to be 10 gauge and have good terminals. Lesser wire can burn up, and original wire is often damaged.
The generator depends on a field ground through the VR to charge correctly. Usually it will have volts at the Arm terminal running if the F terminal is grounded. Jim Jim
 
You say 8.2 volts on the Batt terminal of the VR. That's the same voltage that should be on the battery minus the drop (a few tenths) in the wire path and through the ammeter. It indicates that the VR is good. If all is wired correctly, then it means there is higher than desired resistance in the path. What size (gauge) wire is in this path? Also be good to measure the voltage at the ARM terminal of the VR. It should be close to the 8.2 volts at Batt terminal of the VR. Does the ammeter show any charge? Even though the ammeter is new it could be bad out of the box.
 
Yes Jim...but what I'm saying is this - the "Arm post on the Genny doesn't light a test light or have voltage "when running". The wire I put in is 14g from VR to "L" post of amp meter. Want to let you guys know Im leaving in the morning to my brothers farm - 35 miles North of Kansas City- to watch the Eclipse with him. Ill be back on Tuesday - thanks to both of you for staying with me on this problem- I really appreciate it!
 
I didn't "get into this" from the beginning but you ARE working with a 6 v system, right? # 14 wire in 6 v system in the path from gen to battery is smaller than recommended. As Jim said and I agree I would use # 10 wire in that path.

Also you said no voltage on genny ARM terminal when running but you have 8.2 volts on the VR Batt terminal. WOW, something is really screwed up with this. If there's no voltage on the genny ARM terminal when running, there can't possibly be any voltage on the Batt terminal of the VR. Where do you live? If it's close to southern MN, maybe I could help in person (for a fee!)
 
I did speak wrongly! I should have said that there can be no voltage at the VR Batt terminal higher than actual battery voltage if there is no voltage at the genny ARM terminal.
 
And the wire from the Arm terminal on the gen to the Gen terminal on the regulator must be 10 gauge as well. Jim
 
Oh boy.....a fee? LOL I live along ways from you ! Im 70 miles west of Wichita, Ks. You would have to fly! We will get this! Stay with me guys:) And your right on that last comment ...should be 6.5 on VR if Arm is not working- I will go recheck it all...but its getting late...Thanks.
 
I went back out to shop- engine running the Arm post on Genny reads 0.7 volts with meter; but Batt post on VR reads 7.9 - 8.2v - makes know sense. I have to hit the hay- Ill re-post Tuesday when I get back - thank you guys!
 
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