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Case Tractors Discussion Forum

VAC / 6 Volt / Cutout Relay - Help

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Eric Foster

07-19-2005 14:45:42

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This thing is killing me. I have a 3 ohm resistor between the field and ground for trickle charge. Dead short for full charge.

Everything is working like it should, except the contacts on the cutout relay keep spot welding together (it tries to bleed my battery through the armature every time I kill the engine). I'm getting about 2 amps on trickle and about 13 amps on full charge.

If I back the 3rd brush off to reduce the charging rate, the cutout relay just chatters open and closed which makes the ammeter swing between 0 and 3 amps every second.

I'm thinking about dropping the resistance to about 2 ohms and reduce the charging rate. Any ideas?

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07-21-2005 13:51:21

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 Re: VAC / 6 Volt / Cutout Relay - Help in reply to Eric Foster, 07-19-2005 14:45:42  
E-mail Bob and ask him...he's a semi-wizard on electrons and the flow thereof.

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07-20-2005 11:34:53

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 Re: VAC / 6 Volt / Cutout Relay - Help in reply to Eric Foster, 07-19-2005 14:45:42  
There was a post on Sept 21, 2004 regarding a detailed wiring of generator. Title was VA Case Wiring.....you might want to look it up....if you can't find it...I might have a copy in my files.

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07-20-2005 11:25:37

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 Re: VAC / 6 Volt / Cutout Relay - Help in reply to Eric Foster, 07-19-2005 14:45:42  
From a VAC Manual: GENERATOR Hope it Helps!

The generator used on “VA” Series engines is belt driven, adjustable third brush type having a maximum cold output of approximately 12 amps. The charging rate is adjusted by shifting the position of the third brush, which can be reached by removing the cover band on the rear end of the generator. The movable third brush is on top and a little toward the engine. Moving the third brush in the same direction as the rotation of the armature increases the rate of charge, while movement opposite the armature rotation reduces the rate. A rate of charge of over 15 amps will tend to overheat the generator.

The amperage output of the generator can be controlled and regulated by the light switch which is mounted on the instrument panel. The switch has three positions.

The first position, that is with the switch button in as far as possible, connects a resistance in the field circuit of the generator which reduces the generator output to 3 amperes but does not turn on the lights.

The second position shorts out the resistance, giving the full output of the generator, but does not turn on the lights.

The third position turns on the lights, and also shorts out the resistance, giving full output of the generator.

Whenever the generator is operated without the battery connected in the circuit, the field lead should be disconnected. Failure to do this will cause the generator to burn out.

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Eric Foster

07-20-2005 14:23:42

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 Re: VAC / 6 Volt / Cutout Relay - Help in reply to M5G, 07-20-2005 11:25:37  
Thanks for the help. Sounds like I still have the 3rd brush adjusted too high.

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