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generator

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ben 22

10-11-2006 20:55:26




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i have a ford 3000 tractor and the electriccal light stays on when running how to check generator? i can see sparkles at night in back of gen. when running does that mean anything




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noncompos

10-13-2006 22:41:30




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 Re: generator in reply to ben 22, 10-11-2006 20:55:26  
With all due respect, if you're running at night and your battery stays up, the generators charging...
If you're comfortable taking the generator apart, look inside the case, towards the back (where the armature windings are soldered to the commutator): if you see a thin silvery line around the inside of the case, it's "slinging solder"(the armature windings overheating the solder connection to the commutator) and about to quit charging.
If none, and mica is OK (if mica high it's at least an armature rework or replace)commutator may just be dirty and/or brushes contact area glazed or corroded from sparking/arcing; my Delco book sez to use 00 sandpaper (NOT emery cloth) until commutator clean/shiny. LIGHTLY clean brush contact surfaces, keeping curved contact surface until looks clean.Commutator can be cleaned with gen on and running (if you have the removable cover-band type) but taking apart easier because it lets you check and clean the brush holders and springs for easy movement and good tension. If you have cover-band type, and no cover band, get one; it keeps dust etc out. Good luck.

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Bob M

10-12-2006 06:36:12




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 Re: generator in reply to ben 22, 10-11-2006 20:55:26  
Ben - Best way to check whether the generator is working is with an accurate voltmeter.

First take a reading across the battery posts with the engine shut down – it should be about 12.4 volts or so. Now start the engine and run it at ½ throttle or faster. The voltmeter should now read between about 13.5 and 14.5 volts if the generator is charging.

An occasional small spark visible inside the commutator end of a generator that’s charging is pretty much normal. However continuous sparking says there’s a problem – usually worn out or broken brushes. Time then to go inside the generator and fix the problem before it destroys the commutator!

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buickanddeere

10-12-2006 03:20:47




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 Re: generator in reply to ben 22, 10-11-2006 20:55:26  
It means there is at least some current flow through the amature and brushes. If it's a generator? If it's an alternator then there is current flowing through the slip rings to excit the rotor. There maybe a failed diode in there. It can't hurt to identify every wire. Disconnect the battery, then disconnect the gen/alt and have it's output checked at a shop. A cleaning, fresh bearings and brushes isn't going to hurt.

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