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JD50...Not charging

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Vito Petruzzell

08-13-2002 07:24:06




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I've read the messages on JD's not charging, but they don't seem to cover our problem.I'm assisting my neighbor in restoring a JD50.. 1953 model.The voltage regular is new and the generator has been overhauled by a Delc-Remy(sp)authorized shop.New wiring harness has been installed.The regular has three post.....labled"L", "Bat" and "F". The wiring diagram we use says.."L" goes to the ignition switch,"BaT" goes to the amp guage and "F" goes to the "F" terminal on the generator.There is also a wire comming out the bottom of the reg to the "A" post on the generator. We've polarized it okay but still cannot get a reading on the amp guage when the engine is running. When the lights are turned on..with engine running or off....the amp guage will show a large discharge. Any and all help will be appreciated....Vito

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Don c

08-15-2002 03:15:38




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 Re: JD50...Not charging in reply to Vito Petruzzelli, 08-13-2002 07:24:06  
Have a JD 60 that had the same problem, Had generator rebuilt and new regulator, started up and it discharged, had seen it on his testing machine and it was working like it was suppose to. Called him and he asked me if it had been switched from positive ground to positive positive and ground to ground and it had, he told me to switch the wires on amp guage and it showed charging, has been working good for almost a year .hope this helps. Don

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Clooney

08-13-2002 08:58:23




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 Re: JD50...Not charging in reply to Vito Petruzzelli, 08-13-2002 07:24:06  
Vito, start by making sure you have battery voltage at the [BAT] terminal on the voltage regulator, if not find out why & repair that.
~Then with the engine off, ground the [F] post on the generator & jump power from the [BAT] terminal on the regulator to the [ARM] post on the generator [larger of the two], you should see a spark. That will polarize the generator correctly.
~Then with the engine running at fast idle see if it charges, if not, ground the [F] post on the generator & see if it charges, if so you have an open in the field wire from the regulator to the generator, a bad regulator ground ,or a faulty regulator or generator.
~If it still doesn't charge, leave the [F] post grounded & jump the [BAT] terminal on the regulator to the [ARM] post on the generator & see if it charges, if not you probably have a generator problem [or the ammeter is connected incorrectly].
~To test the generator, make sure you have battery power at the regulator [BAT] terminal, then remove the fan belt from the generator, then remove the [F] wire at the generator, then jump power from the [BAT] terminal on the regulator to the [ARM] post on the generator [the generator should start to motor, then reconnect the field wire, the generator should slow down. If not ground the [F] post at the generator to see if it slows down�If it motors & slows down the generator is probably good, if it motors & doesn�t slow down you probably have a bad field & if it doesn�t motor at all the generator is probably bad.
~If the charging system checks out ok, make sure you have the ammeter wired correctly. The wire running from the ammeter to the regulator MUST not be connected to the same side on the ammeter as the battery wire from the battery or starter, there should only be ONE wire on the battery post of the ammeter..
~If at ANY time you connected or even touched battery power to the [F] terminal on the regulator suspect a bad regulator���

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ChuckW

08-13-2002 08:25:19




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 Re: JD50...Not charging in reply to Vito Petruzzelli, 08-13-2002 07:24:06  
those charging systems are the down fall of the electrical system. You may have a bad regulator. You have to be careful polarizing them, besure the engine is not running. Also I always spray some PB blaster on the brushes, it seems like there is some contact problems from time to time. The main reason these units have problem is that the exhaust pipe is about 3" from the regulator, heat and vibration really work on them. Very poor setup.

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