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Case Tractors Discussion Forum
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48 vac charging system

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mike

07-29-2004 12:35:50




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ok, my grandfather thought is was a wise idea to rewire my VAC when he painted it. or partially rewire it. He basicly removed the light switch from the loop I believe as he installed a toggle switch for the lights. According to the amp gauge, its charging about 20 amps. I don't think that would be correct. My generator has a cut out instead of a regulator. I would be happy to install a regulator in leiu of the cut out. is there any other wiring that I would have to change to do this? I don't think the switch works now(thats probably why he eliminated it) and I thought it would be easier to install the regulator. Any help and thought would be greatly appriciated.

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mj

08-01-2004 16:47:03




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 Re: 48 vac charging system in reply to mike, 07-29-2004 12:35:50  
third party image

Here's the original cutout system for reference.



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Klyde

07-30-2004 10:24:03




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 Re: 48 vac charging system in reply to mike, 07-29-2004 12:35:50  
You don't say what was done with the field wire that ran to the resistor on the light switch. If it is hooked to ground that would explain the high charge. In the off position field goes through resistor to ground (3 ohms sounds right) in the second position it is connected to ground by the switch. Alot of these switches were replaced over the years that were fine,just that they had lost there ground to rust and poor mounting. hope this helps

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mike

07-30-2004 04:51:21




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 Re: 48 vac charging system in reply to mike, 07-29-2004 12:35:50  
OK, got the switch working I believe. I shows that still charging about 20 amps when the lights are not on. If I turn on the lights, it shows about a 12 amp charge which from what I understand is about normal with lights on. The little resister wound wire isn't in the best of shape. I get about 3 ohm of resisitance. Does anyone know what is should be? I was thinking of going to radio shack and buying a new one.

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Jerry W

07-29-2004 14:47:47




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 Re: 48 vac charging system in reply to mike, 07-29-2004 12:35:50  
It is not just a wiring change. A cut-out relay is used with a 3 brush type generator and a regulator is used with a 2 brush type generator. A 3 brush generator could be converted to a 2 brush but why don't you just fix the 3 brush system. It charges so it must either have the 3rd brush set too high or it is wired wrong from the light switch.

Just my 2 cents - Jerry



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mike

07-29-2004 14:58:28




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 Re: 48 vac charging system in reply to Jerry W, 07-29-2004 14:47:47  
I believe the light switch is pretty much by-passed. I have to dig further into it. I would be happy with a working switch. I just figured it would be "better" or more modern with a regulator in lieu of the cut out.



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Jerry W

07-29-2004 15:28:17




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 Re: 48 vac charging system in reply to mike, 07-29-2004 14:58:28  
VAC's have very little demand for electricity and the original 3 brush systems are more than adequate. If I were going to change anything I would just go to a 12v alternator system.

Jerry



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Brad Kocka

08-03-2004 04:20:26




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 Re: 48 vac charging system in reply to Jerry W, 07-29-2004 15:28:17  
The switch on my VAC went as well. The resistor should be around 3-4 ohms to ground. This will reduce the charging rate to around 3-4 amps. That way you will not cook the battery. I used a DPDT switch to switch the lights and the charging circuit. When the lights are on the 3rd brush goes to ground. Produces 15 amps charging current. When the lights are off the 3rd brush passes current through a ceramic ballast resistor to ground. The kind they used to use on old ignition systems.....Haven't had a problem since....

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