3010 Generator Light

Bob Foos

Member
I took my 3010 gas to a local tractor mechanic for hydraulic problems I couldn't fix. While he had it he told me the starter went bad, and he replaced it. When I went to pick up the tractor he told me the generator light was on and the generator was bad (it wasn't bad before I took it to him). I told him I'd fix the generator and took the tractor home. I took the generator to a local starter/alternator shop and they fixed the generator. They said it had a bad wire in the armature. When I picked it up today I brought in the regulator in since he wanted to check both the generator and regulator hooked up together. He said the regulator was also bad. I went to NAPA and got a new on. I installed both this afternoon. I excited the generator like instructed. I started the tractor up, and guess what - the generator light is still on!!!
What do I do now - How do I troubleshoot this to narrow down and identify the problem?
 
12 volt or 24 volt? If 12 volt do as follows:
Forget the light for now and do a test with a multimeter. With the tractor off check the battery voltage. It should be about 12.4 - 12.6 volts. Then start the tractor and at about 1,200-1,500 rpms the battery voltage should be about 13.5 volts. If this is the case the generator is working and charging. If the gen light is still on in this case there's possibly a short in the wiring. Also check all connections and condition of the battery. If there's no voltage increase at engine speed there's still a problem. Take both generator and regulator to a reputable auto electric shop for another test.
 
Heres my Non Charging Troubleshooting Procedure for Class A Charging Systems. In Para 5 it tells how to effectively by pass the Voltage Regulator functions to see if failure to charge is the fault of the genny versus the Voltage Regulator. It also has a Motor Test to test the genny.

If you havent polarized, you may wanna do that just to make sure!!!!!! Temporarily ground the Gens Field post to case then momentarily flash jump a wire from the VR"s BAT terminal over to its ARM (or GEN) terminal (or direct to ARM post on Gen) and you ought to get a spark. Always try the simple fixes first!!!!


1) For a good working Gen to get to and charge the battery, it has to have a path usually from the Gens ARM post output,,,,,,,,,,,To and through the cutout relay portion of the VR (between its ARM and BAT terminals),,,,,,,,,Up to the Load (NOT to battery) side of the Ammeter (if it has one),,,,,,,,,To and through the ammeter (if it has one),,,,,,,,,,From BAT side of ammeter to ungrounded battery post, often via the starter lug post. Is yours wired that way or equivalent ??? The ammeter (if it has one) should read hot battery voltage on BOTH terminals, does yours??? Even if an ammeter were stuck (but still continuous) as RPM increases the battery voltage should rise from 12.6 to near 14 volts (half that for 6 volt) and/or the lights glow brighter. Have you tried that in case the ammeter isnt working right???????

2) If the above is so, the BAT terminal on the VR MUST ALWAYS READ HOT BATTERY VOLTAGE. Does yours??? If not, the Gen cant get to and charge the battery.

3) The Gen to VR wiring is as follows:

BAT on VR to ammeters load (NOT battery) side

ARM (or GEN) on VR to Gens Armature post.

FLD on VR to Gens Field post.

(L) Load (if you have a 4 wire VR) up to BAT supply input terminal on switch to feed loads like lights and ingition.

4. THE GEN AND VR MUST BE WELL GROUNDED AND THE BELT GOOD N TIGHT. If any doubt, run a ground wire from the grounded battery post or clean solid frame member direct to the Gen and VR and see what happens?????????????????????????

NOW, if the Gen and VR are grounded,,,,,all is wired correct,,,,,,,,BAT terminal on VR is HOT,,,,,,,,Belt is tight,,,,,,,,,ammeter is good n continuous n works but she wont charge, have you had the batteries tested lately????? Is there electrolyte above all the plates and no cells have a gray or milky appearance?????? A bad battery may not accept a charge you know!!!!!!!! If she dont, proceed below to see if its a Gen or VR problem (AFTER you have insured the wiring per the above)

TO DETERMINE IF ITS A GEN OR VR PROBLEM

5. With the tractor running, temporarily ground the Gens Field post to case. If she charges then, the VR may be bad, or a wires missing from VR"s Field post to the Field terminal on the VR, or the VR isnt well grounded.

6. If she still dont charge, leave Field grounded and jump a wire across from the VR"s BAT and ARM terminals (jump by passes the cutout relay) and see if she charges. If then but not otherwise, the VR"s cutout relay isnt working correct (maybe points burned/carboned/resistive)

7. With the 2 steps above, you have basically by passed the VR functions, so if she still dont charge, you"re left with a bad battery or wiring or the Gen itself.

8. MOTOR TEST. You can Motor test the Gen. If its grounded and you remove the belt and apply hot battery voltage direct to its ARM Post, it should motor n run well (Armature n Brushes and Commutator okay). Then if you ground the Field and it slows down some, the Fileds probably good. If it passes both those tests, it should charge, and if not, it may be a wirign or battery or grounding problem.

9. Typical Gen problems may be the brushes are worn down or the hold down spring assemblies are stuck/corroded/dirty and arent pushing the brushes tight down against the commutator. Check those things out. Worse may be bad fields or armature etc. Air and WD 40 etc can clean and free them, the hold downs must be free n snap and hold the brushes DOWN TIGHT.


SUMMARY: Check the wiring,,,,,The Genny and VR grounds,,,,,,Insure BAT on VR is hot,,,,,,,check battery (maybe load tested and Specific Gravity checked),,,,,,,,,good tight belt,,,,,,,insure ammeter is continuous (BOTH sides HOT),,,,,,see if battery voltage rises above 12.6 (6.3 for 6 volt) and/or light glow brighter,,,,,,,,,do the Field and cutout relay VR by pass checks,,,,,,,,insure the Gens brushes arent worn down and the hold down springs are free n clean and push the brushes down tight,,,,,,,,,,,check the connections,,,,,,,,,try the Gen Motor Test to see if its good.

You may just have a bad battery or bad ground or connection if you say the Gen and VR are okay.


Good Luck n God Bless, let us all know.

John T Nordhoff in Indiana
 

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