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 01-21-2004, 22:32 Post: 74682
mark105
2004-01-21 22:32:50
Post: 74682
 Electrical Problem on 4300

Hoping someone has had this same problem to narrow my search. I have a 4300 with only about 75 hours on it. Lately have been noticing when working at night the headlights will dim for a few seconds, when this happens the tach will also drop the rpm's. Although the engine speed is not changing. This will occur every two to five minutes and just for about 3 seconds then back to normal lights and tach. Anybody have suggestions of where to start looking...thinking maybe a bad ground??

Thanks!
Mark






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 01-22-2004, 08:37 Post: 74698
TomG

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 Electrical Problem on 4300

I'd check with your dealer to see if it's normal--could be just the fairly normal workings of the regulator. You might try trickle charging the battery for 24 hours or so and see if that clears the problem. I don't know how the tack works but many gauge circuits are ballasted to a constant 9V so variations in alternator voltage don't affect gauge readings. If it's an electronic tack and it's ballasted there might be an issue. A manual would give procedures for troubleshooting the regulator.






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 01-23-2004, 10:32 Post: 74813
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 Electrical Problem on 4300

Mark this only happens at night? Try looking for a wire to ground problem in the lighting system wires. Have you added any new lights or other bolt ons? Could have a pinched wire. Also make sure the Alternator belt is tight This is for starters.






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 01-23-2004, 11:15 Post: 74827
DRankin



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 Electrical Problem on 4300

Could be a ground problem.

Or a sudden sporadic load. There aren't too many heavy draw items on a diesel tractor. Glow plugs come to mind......






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 01-23-2004, 11:27 Post: 74828
Chief



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 Electrical Problem on 4300

If in fact you are having a current draw event; you may have a problem with the engine intake grid heater system. The problem could be in the ignition switch, a relay, etc. You may have even pushed the key switch in by accident. (highly unlikely) The intake heater grids on my Cummins severely draw the current/voltage down. (i.e. around 7 volts on start up) This is normal. Does not sound normal on your 4300 though. Just a thought on a theory.






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 01-24-2004, 12:45 Post: 74948
mark105



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 Electrical Problem on 4300

It seems by the responses that the alternator or regulator could be the problem. This could be happening during the day, I probalby would'nt notice it as the the only reason I notice it at night is the lights dim so I look at the dash to see what is going on and the tach drops down to about 1/4 of current RPM. Just the tach, motor does not drop. I asked my dealer for ideas and the one thing he mentioned was the tach is run by impluses from the altenator not a sensor on motor. Faster the altenator spins more the tach reads. I have looked for loose wires and can not find anything...maybe a bad altenator. Would this be possible with such low hours?
Thanks!!!






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 01-24-2004, 18:23 Post: 74964
TomG

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 Electrical Problem on 4300

You might check the fan belt for tightness. Yes almost anything is possible even on a new hour machine but some things aren't too likely.

I should think about my ancient basic electronics. Off the top of my head, I think it's possible for an alternator problem to lower both lower the alternator voltage and frequency outputs, which could affect both the lights and tech readings. I believe regulators only affect voltage output and changing voltage output shouldn't affect that type of tach.






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 01-24-2004, 21:33 Post: 74976
mark105



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 Electrical Problem on 4300

Thanks for the feedback. The altenator belt seems pretty tight. Noticed today that it is acting up more then usual. Maybe it will eventually do it all the time so I can find the problem. Hate electrical problems...I think I would almost prefer for something to break. Then at least you know what to fix. I think my next step is to check the output on the altenator and see if it is consistent. One last thought, this is happening when blowing snow, wonder if snow could get on the belt and cause it to slip...kind of a long shot.






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 01-25-2004, 10:04 Post: 75000
TomG

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 Electrical Problem on 4300

I symphasize. when I was teching in the AF we used to call it Brogan Maintenance. Beat on something and it either fixes it or breakes it so you can find what's wrong.

I'll now just babble and maybe something will pop up. I think the key to finding the problem is noting that the light dimming and tach drop go together and seem to be independent of low rpm. I originally thought a pulse couting tach might be fairly independent of voltage change but now I'm not so certain. I'll speculate on how it might work. Rectified AC fed either triggers a pulse generator or is fed to something like a zenor diode so only the peaks pass. Pulses go to a long RC circuit that is used to bias a semi-conductor. More rpm equals more pulses, which increases the bias and current flow. The tach is just an ampmeter.

If that's the way it works, then a intermiddant bad ground could affect both lights and tach, but so could a weak diode in the alternator bridge if output wan't sufficient to trigger a pulse. A format alternator test would be good. It might show something to run an independent ground from the tach to the battery negative pole.






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 01-25-2004, 10:58 Post: 75008
mark105



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 Electrical Problem on 4300

Tom, thanks for the info. I will try the ground from the altenator first then move onto testing the output. Thanks again!






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

Thread 74682 Filter by Poster:
Chief 1 | DRankin 1 | mark105 4 | popabear 1 | TomG 4 |




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