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Generator Dilemma

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9nTony

01-20-2001 17:26:56




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My generator went bad, took and had it rebuild, was told it was a bad coil. The brushes/armature and fields all checked out. Put it back onto "Ole Henry" and nothing! Checked output with ohm meter at the generator, read zero, amp meter reading the same. Took it back to the shop, was told it was reading 30 amps. Tried it again and got the same results. Borrowed a used generator from a friend who converted his over to 12 volt system, and it immediatley read 10 over at the amp meter. Took the generator to another shop who discovered that coil had been installed wrong by 1/2 of a turn, which meant wires would only reach the wrong terminals [wired wrong]. While waiting for generator to be rebuilt I also replaced the cutout and resistor block due to corrosion. Put it back on "Ole Henry" and once again nothing. Am I over looking something? I put the borrowed generator back on the only problem is the new cutout has gone bad, while it closes when the tractor starts, like it should, when I turn the tractor off, the contacts remained closed and the amp meter shows a negative 30 until I manually disengage the contacts. While this explains the battery going bad, what caused a cutout that is only two weeks old go bad, was it something with the problems I had with the generator? Your help will be greatly appreciated. Tony.

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Claus

01-21-2001 04:21:43




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 Re: Generator Dilemma in reply to 9nTony, 01-20-2001 17:26:56  
The cutout relay has 2 coils in it. One is the shunt winding. This is the winding that closes the contacts when the voltage reaches about 6 volts. The other winding is the series winding and is the heavy wire one. This winding should open the contacts when the reverse current is about 3 amps. This winding bucks the shunt winding. In other words it works contra to the shunt winding so the contacts will open. If this winding is open (Burnt open) then you could not get any charging since it is in series. The only thing that I can think of is that this winding overheated and caused some of the turns to short. This would reduce the amount of magnetic field this winding could produce. You should be able to see that when you remove the cover of the cutout. For the generator to cause this, it would have to put a very high current. There is no current limiting in the cutout relay as is in the 8N Voltage Regulator.
Happy Motoring
Claus

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