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Allis Chalmers Discussion Forum
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Did I burn up my cutout switch?

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Bo in Maryland

08-10-2004 08:36:29




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.....Put a new battery in the WD45 [6volt positive ground] and wasn"t paying attention so I hooked the cables up backwards..... funny thing was the tractor actually ran with the battery hooked up backwards....about 15 minutes later I shut it off and noticed the ampmeter was showing a 15 amp charge with the key off!, plus the light switch was hot as hell..... I corrected the battery cable hook up and the tractor runs fine, but the ampmeter shows no charge when the tractor is running; even when the light switch is pulled out one notch to the "high-charge" position; it used to read 15 amp charge in that position.....have I burned up my light switch?, or maybe my cutout?, or maybe even my generator?.....any advice/experiance/comments would be most welcome.
Good luck to all!
Bo

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Greg Ballantyne

08-11-2004 05:18:26




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 Re: Did I burn up my cutout switch? in reply to Bo in Maryland, 08-10-2004 08:36:29  
Sounds like what I did to my B a couple of years ago replacing the battery. The new battery was a little taller and the posts got too close to the box lid, which shorted to ground fairly quickly. My meter doesn't show a charge any more, and the switch has no effect. I assumed I had fried several parts, but maybe its just the cut out switch.



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steve(ill)

08-10-2004 19:50:09




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 Re: Did I burn up my cutout switch? in reply to Bo in Maryland, 08-10-2004 08:36:29  
it appears you have a solid state cutout.--- to test the generator, bypass the cutout by connecting the two wires together and see if the generator charges now accoring to the amp meter. ---- if tht dont work, ground the "F" terminal on the generator and see if that works, that bypasses the swticha nd resistor (ground side).----- if that dont work, take both wires off the generator, ground the "F" side. start tractor and measure the open voltage between "A" and "F" terminals on the gnerator. should have about 20 volts on a 12 volt system. almost 15 volts on a 6 volt system. this tests the generator only. you have bypassed the "F" ground at the switch and the "A" cutout wires.

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Butch

08-10-2004 10:04:19




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 Re: Did I burn up my cutout switch? in reply to Bo in Maryland, 08-10-2004 08:36:29  
The system is pretty tough as a rule and usually the only thing that gets fried is the cutout relay. Disconnect the battery and remove the cover from the relay, the points should be open, yours are welded together. Sometimes a person can gently pry the points apart and dress them with a file and sandpaper (don�t use emery cloth) and nurse the thing back to life. If not install a new cutout relay. Step 2 is to re-polarize the generator and check the system for other faults. Remove the cover from the cutout and loosen the fan belt or remove it so the generator can freely turn. Hook the battery back up and have a helper to watch the amp gauge. Push the relay contacts together with your finger (engine off) for a second. The generator should turn or 'motor", and the amp gauge should read a discharge, if so your system, except for the field grounding, has been checked and is OK and you have just repolorized it. Assuming that it motored and you showed a discharge tighten the belt and start the tractor. It should now charge unless you fried something in the switch or ground wire. If it does not charge try grounding the field (F or some are marked with a small triangle) terminal of the generator directly to the ground (+) terminal of the battery triangle. If it them charges you need to get into the switchbox and find out what is wrong with the field grounding circuit. The three position switch grounds the field to make the system charge, directly to ground for high charge and through a resistor for low charge. Good luck

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Bo in Maryland

08-10-2004 18:21:41




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 Re: Did I burn up my cutout switch? in reply to Butch, 08-10-2004 10:04:19  
thanks for the feedback Butch...I pulled the cutout relay switch off the generator and it"s all one piece with no cover to remove...it has two posts one of which was wired straight to the body of the generator...the other post has a wire that goes back towards the operator"s station...the label on the cutout reads "Transpo D100"....above that it says: "Bat PosGnd Arm"...below that it says:"Arm NegGnd Bat"..... .if you turn the switch over the back is entirely sealed in a heavy black tar-like substance so that you can"t get into it..... .got any idea what I"m dealing with here?..it doesn"t look anything at all like the picture of the cutout relay in my owner"s manual....my hunch is that it is some kind of solid state updated version...thanks for any light you might shed.....
Good luck to all!
Bo

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Steve in N.J.

08-10-2004 21:22:07




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 Re: Did I burn up my cutout switch? in reply to Bo in Maryland, 08-10-2004 18:21:41  
Bo,
We have the D100's in stock if ya think ya need one. Drop us a line if interested....

Steve/B&B Custom Circuits



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Joe K4MD

01-23-2006 09:01:18




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 D100 Price in reply to Steve in N.J., 08-10-2004 21:22:07  

Availability and price, please.



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