calling janicholson.......again......

glennster · Oct 5, 2008

ok jim, i followed your instruction on bypassing the vr. when i touched gennys arm wire to the bat terminal of the vr, got a big spark and it pegged the ammeter to discharge, wires got a little warm too!!! the ammeter seems to be wired corectly as it does swing a few amps to the discharge side with the motor off and ignition on. also swings same way with headlights on, engine off. so what do you think, bad vr? i thing this tractor is possessed by electron demons!!

Brownie 450 · Oct 5, 2008

Just butting in here---sounds like your generator has the arm. terminal grounded--are the arm. terminal insulators in good shape? Any chance the "hot" brush wire is touching the case inside the gen?
With the gen. belt off & the gen. hooked up to the VR, try a jumper wire between the BAT. & GEN. terminals on the VR. The Gen should "motor"---that is should run by itself. If it doesn't, the Gen. has trouble.

glennster · Oct 5, 2008

gen was just rebuilt, new vr and all new wiring, took the gen back to the rebuilder, he put it on the machine when i was there, charges perfect. i 'm baffled.

Brownie 450 · Oct 5, 2008

Another thought here---suppose the field is going to ground & being it is connected to the "hot" brush, that could be dragging voltage down & effectively grounding the ARM. terminal. Even though the GEN. shop confirmed that the GEN. is working, I'd pull the back cover off & take a look to see what the wires & brushes looked like.

glennster · Oct 5, 2008

i can see the brushes thru the back of the genny. they are new. the genny is from an early 1960's chevy. 12v. the genny will motor, when you remove the field jumper wire from the case, it momentarily speed up.

Janicholson · Oct 5, 2008

Assuming your polarities are correct (I believe they are) the only possible answer is that the generator is shorting to ground internally. It could be many things, but there is no way it should make warm wires doing the test.
Disconnect the gen from all wires. If you can get through the endframe, to the brushes, use a pic or pointed wire to lift them off of the armature. Put a piece of card stock under them to insulate them from the commutator bars. Then test the resistance of the Arm terminal to ground. If it shows ground, it has a short.
If not, it will require disassembly of the gen to test the armature for shorts. Google Delco Remy A type generator images/And info. JimN

boomer22 · Oct 5, 2008

Had virtually the same problem, Try a different VR

glennster · Oct 5, 2008

thanks jim, i will give that a try, have to wait till next weekend the tractor is at the other place. i will let you know what i find out. thanks again, glenn

teddy52food · Oct 6, 2008

Take the wire off the arm or gen terminal of the generator and try touching the other end to the batt of the regulator. If it still sparks, the wire is grounded.

calling janicholson.......again......

glennster

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Brownie 450

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glennster

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Brownie 450

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glennster

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Janicholson

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boomer22

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glennster

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teddy52food

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