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Tractor Talk Discussion Forum

OC46 generator amp output

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Polk Crawler

07-21-2003 14:43:44




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Put in a new voltage regulator; at moderate rpm charge indicator needle goes almost off the ammeter dial, 20+ amps. Service manual says max generator output is 35 amp. Battery and system is 6 V; installed volt reg according to instructions, polarized it. Battery charger shows battery is charged. Have a feeling something not right...amp charge much higher than expected.. Help? Thanks.




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Gene Davis

07-21-2003 18:40:55




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 Re: OC46 generator amp output in reply to Polk Crawler, 07-21-2003 14:43:44  
There are 2 things I would check for myself. You mentioned the amp dial was only rated at 20 amps. It may not be of a large enough capacity, if so it will soon bend needle and probably trash meter,it should be charging full tilt for a few minutes to replace the power used to crank, then should taper off to almost 0 amps. A generator will charge full amps and maximum producable voltage also when the fields are grounded. The 3 position light switches vary the amount of resistance to the field circuit to control charging rate. Maybe you should check out put with a d.c. voltmeter also. Too much voltage and amperage will boil the acid out of the battery, or explode it--NASTY,& DANGEROUS-- if the field coil or post/and/or wire leading to regulator is grounded, it will also sling out the solder from the communtator strips and burn up the armature. Maybe check for a pinched ground wire from the voltage regulator to the generator,maybe the wire lead has a raw spot, or pinched under the mounting bracket. Is the regulator the correct match for the application? Was the generator tested for before the regulator was installed/ to make sure you were not throwing a new regulator up for sacrifice to the same problem if there was a problem? Gene Davis

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Polk Crawl;er

07-22-2003 07:02:00




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 Re: Re: OC46 generator amp output in reply to Gene Davis, 07-21-2003 18:40:55  
Gene: Had gen and old reg bench tested at local tractor/implement dealer repair shop; old reg faulty, new one purchased and installed CAREFULLY by directions in box; I have not run engine more than long enough to see ammeter needle go off the dial, then shut down; retired auto mech friend of family coming this AM to do his thing. All connections from reg to gen including battery wire made according to printed directions. Thanks for your reply. PC

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