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1984 JD 1050 charging lite stays on

N

njs458

Member
Replaced alternator and battery. Charge light still on, bat volts measure 12.55. What could cause the light to stay lit?
Thanks.
 
On a 12 volt system you should have 14-14.5 volts with the engine above a fast idle. The regulator may need replacing. Hal
 
As Hal points out the charge light is burning because the alternator is not charging. Assuming the wiring is OK and properly connected, possible causes:

If the alternator is a Delco 10DN (external regulator) most likely the regulator is bad.

If it's a Delco 10SI (internally regulated), or a Hitachi copy, either the internal regulator is bad or the #2 terminal aux connector is not seeing battery voltage.
 
(quoted from post at 12:05:09 09/25/15) On a 12 volt system you should have 14-14.5 volts with the engine above a fast idle. The regulator may need replacing. Hal
Click to expand...

I will test it with tractor running. The new alternator is a direct replacement.
 
With the tractor not running, unplug the voltage regulator. Crank the tractor and run at
least 1/2 throttle then take a volt meter reading with the the voltage regulator unplugged.
On the wires from the alternator it should read about 20+ volts If you get this voltage from
alternator, there is a problem with regulator or the plug. I had this happen once on my
1981 year model 650 once and the regulator was bad.
 
After a last resort move I bought a new voltage regulator (solid state type). Charging lite goes out once started. Battery reads 12.47 volts engine off and 17.2
volts with engine running. Sound ok to you?
 
17.2 volts is too high. That voltage will cause the battery to boil. 14.5 volts should be the upper limit, 14.2 would be better for Ag equipment use.

Measure the voltage when running at the battery. If the at the battery is less than 14.5 it may indicate a weak or dead battery and the alternator has to raise its output voltage that high trying to get the battery to the proper voltage. If that is the case do not expect a new alternator to last very long. They have a short life when continually running at maximum output.
 

I have had trouble with the alternator not being grounded on john deere tractors.. so... clean the bolts and connections at the block, alternator and bracket to get a good ground and the voltage problem may correct itself. Seems too much green paint is not a good thing.
 
(quoted from post at 01:39:35 10/11/15) 17.2 volts is too high. That voltage will cause the battery to boil. 14.5 volts should be the upper limit, 14.2 would be better for Ag equipment use.

Measure the voltage when running at the battery. If the at the battery is less than 14.5 it may indicate a weak or dead battery and the alternator has to raise its output voltage that high trying to get the battery to the proper voltage. If that is the case do not expect a new alternator to last very long. They have a short life when continually running at maximum output.
Click to expand...

Are you saying that I need to ground this solid state voltage regulator? I did not ground it.
 
(quoted from post at 15:10:54 10/23/15) Yes, for sure if it is a 10DN with external regulator.
Click to expand...

I will ground it and see if output drops to the 14 volt range. Thanks for chiming in.
Jeff
 
(quoted from post at 19:32:45 10/25/15)
(quoted from post at 15:10:54 10/23/15) Yes, for sure if it is a 10DN with external regulator.
Click to expand...

I will ground it and see if output drops to the 14 volt range. Thanks for chiming in.
Jeff
Click to expand...

Grounded VR, still runs 17.2 volts.
 
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