More 6v questions for John T

John,
Still having problems. I have 6v on both sides of ammeter and I have 6v at the BATT terminal of the VR. I ran a good ground from gen case to frame. I did the tests you prescribed to check the VR. Still no charge. I did the motor test too. How fast should that motor run with 6v from VR BATT terminal? This one seems like it runs pretty slow but does speed up a little when I pull the ground off of the field. Other than that I am really stumped.

You might also run a good frame ground to BOTH the VR andddddd the Genny just to be safe.

Then with her running dead ground the Gennys FLD post n see if she charges then?????? If so but NOT otherwise the VR is bad or not well grounded or the wires open from FLD on VR to FLD on genny......

If still no charge even when running with gennys FLD post dead grounded,,,,,,,run a jmper wire to jump BAT and GEN/ARM on the VR together (that by passes the internal cutout relay in case its bad) n see if she charges then?? If still not, the VR is out of the equation so the genny must be badddddddddddd

How you know if its charging or not??????? If you put a volt meter on the battery it should read around 6.3 when shes setting but when running at fast RPM a good genny should raise battery voltage from 6.3 to at least 6.5 to 7 or so volts ASSUMING THE BATTERY IS GOOD ENOUGH TO ACCEPT A CHARGE ???? Sure the battery is okay???

The genny cant charge the battery unless it has a path to it, thats from GEN/ARM to BAT on VR via the closed cutout relay........to and through the ammeter,,,,,,,,to the ungrounded battery post often where the big battery cable attaches to starter switch/solenoid.... But if you show battery voltage getting to BAT on the VR that must be okay

The motor test, it ought to spin fairly fast not just drag or barely turn which means the brushes and armature are at least decent. If you run the VR by checks above and regardless of a grounded genny FLD and VR by passed she dont charge and she spins slowwwwwwww on the motor test I suspect the genny. Typical problems are brushes worn down too short,,,,,,,,,,,,Commutator is greasy or carboned up (clean it),,,,,,,,,brush hold down springys are sticking (clean and exercise them) ,,,,,field windings are shorted or open,,,,,,,,,bushings allow armature to drag thats realy really badddddddddd

John T

I've had a volt meter on the battery when performing all the tests you mentioned and the needle does not move. The only thing I haven't tried yet is doing a separate ground for the VR. I'm gonna run the genny in again and have them put it on the stand too.

I'm having a similar problem with my A. I just put on an all new electrical system - battery, wiring, generator and regulator and don't see the gauge move. I haven't had time to trouble shoot but this discussion and the previous one to this one will be a big help to get started. Tractor has a mag so I just want the electrical system to work for the starter and eventually lights.

check the ammeter it could be open or somethingelse wrong. I hook one terminal to a batt other to a lite to see if the needle works then revese the leads on the ammeter to see if the needle moves other way. They can show ok with an ohm meter but needle can be stuck.

Turns out the VR I got from the repair shop last spring was way out of adjustment. He put it on the stand and set it to where it out to be and now it works great!

Now onto my M. I have a 39 M converted to 12v with a generator and a magneto. None of Farmall Bob's diagrams seem to apply directly to my setup. I am running Batt. Terminal on VR to left side of ammeter when looking from back. L terminal of VR also runs to left side of ammeter. Lead off of right side ammeter goes down to starter button. It has one of those weird looking old light switches with a resistor built in. Nothing hooked to that right now. Connections between VR and genny are normal. It is not charging. Care to take a stab?

Let me see if I understand what you have done.

wire from bat terminal on VR to left side of ammeter AND
wire from L terminal of VR to left side of ammeter also ???

If this is how you have it hooked up it is not correct.

The correct hookup is:
wire from BAT terminal of VR to left side of ammeter.
wire from L terminal of VR feeds lights if so equipped and ignition switch if equipped with battery ignition. If you have a mag and no lights, there is NOTHING connected to the L terminal.

Only two wires to ammeter, one on each post. If the ammeter reads backward, then swap the two wires on the ammeter.

Use John t analysis document on this one as well. The L terminal should be hooked to the light switch fuse input terminal. (do that, but then follow the chart). Jim

If it were wired correctly, as Jim and Tractorman pointed out, the VR's L terminal feeds hot battery voltage to loads (lights, ignition etc) INSTEAD OF them being fed off the ammeter terminal that wires down to BAT on the VR. The loads still get hot voltage to work IFFFFFFFFF fed from the ammeter even if the VR's L wasnt used and hooked up at all as thats what happens if you dont have the VR L terminal. HOWEVER I would do as they indicate and dont hook the L to the ammeter, but instead run a wire from L up to the light switch (for BAT input voltage) and remove any other wire from the ammeter that wires to the light switch.

John T

(quoted from post at 09:04:41 11/08/12) I'm having a similar problem with my A. I just put on an all new electrical system - battery, wiring, generator and regulator and don't see the gauge move. I haven't had time to trouble shoot but this discussion and the previous one to this one will be a big help to get started. Tractor has a mag so I just want the electrical system to work for the starter and eventually lights.

Click to expand...

Have you polorized it?

Rick

If he motorized it, it is polarized.

Okay, I now have the wiring hooked correctly on the M. It charges very sporadicly with the needle bouncing around and sometimes charging sometimes not. Made sure I had a good ground for both genny and VR. No change. I then grounded the field post on genny to the case and she charges really good. I guess this means the VR has as issue. It is only a couple of years old but that appears to be where the problem lies.