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Allis Chalmers Discussion Forum

allis wd high charge/low charge

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08-06-2007 17:37:57

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it seams to me like i have 2 charge settings on my wd. it uses a negative ground system. the light switch pulls out half way, and the lights go on, and pull it out all the way, and the ammeter jumps to 2o and beyond at idle. is it really charging this much? if it is, is it safe to run a dead battery in it like i been doing? i've been hand cranking it the past few months. after charging for a while on the "high charge setting", the battery won't spin the starter. all my other allis's don't have this, so i was just wondering whats going on. i know my battery's dead, but i just wanna know a little more about this charge setting thing.

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John T

08-06-2007 19:44:15

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 Re: allis wd high charge/low charge in reply to sparkplug, 08-06-2007 17:37:57  
Although a genny can still charge at either Pos or Negative ground once polarized, if battery polarity is changed the ammeter leads need swapped/reversed or else it will register bass ackwards. Also if the battery is at incorrect polarity and you dont correctly re polarize the genny, a Voltage Regulator can go badddddddd.

The typical 3 position light switch is for low charge and high charge usually on 3 brush gennys that use a simple 2 wire cutout relay versus a full fledged voltage regulator.

I think I would re connect the battery at the original correct polarity,,,,, POLARIZE the genny,,,,,,,,, start her n see if she charges or not?????????? If she charges a correct connected ammeter will swing to + charge at RPM,,,,,,,lights will glow noticeably brighter from slow idle to fast RPM,,,,,,,,,and battery voltage will rise from 6.3 volts setting to around 7 at high RPM (twice that on 12 volt system)

If you need my complete long winded Troubleshooting Procedure for NON charging, post back n let me know

John T

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Jim McDonald

11-06-2007 10:10:28

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 Re: allis wd high charge/low charge in reply to John T, 08-06-2007 19:44:15  
My D-17, positive grounded system will not charge. I have replaced the voltage regulator twice and had the generator rebuilt. However, I am not sure what polarizing the generator does. Any thoughts on trouble shooting this problem would be appreciated.

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Jerry Coulter

08-06-2007 19:20:44

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 Re: allis wd high charge/low charge in reply to sparkplug, 08-06-2007 17:37:57  
The factory setup is 6 volt positive ground. The light switch also controls the charge rate. When switch is in, the generator field is grounded through a 2 amp resistor for slow charge. This is fine for all day work. When the switch is pulled half way out, the lights are turned on and the generator charges full amp. When the switch is pulled all the way out, the gen charges full amp. The amp is adjusted by a sliding brush in the generator. The gen will charge either positive or negative, whichever it was flashed when installed. But if it was flashed for positive ground and you have a battery installed negative, the battery will go dead and stay dead if being charged backward.

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