Alternator Battery Regulator???: John Deere Review  -- John Deere Tractors Discussion Forum and Review Alternator Battery Regulator???: John Deere Review -- John Deere Tractors Discussion Forum

  parts   |   manuals   |   discussion   |   photos   |   podcast   |   reviews   |   specs   |   dealers   |   classifieds   |   contact   |   faq   |   myProfile   |   home          Login Now | Sign Up


FAQ:   What is a tractor?

Forum Index
New As Posted | Active Subjects



www.emerichsales.com - New & Used Equipment
          View Tractors For Sale!


www.partsbynet.com - Lawn and Garden Equipment Parts


Bernardsville Landscape Lighting
Click to Post a New Message!

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

Page [ 1 ] |
Reply | Pop Up Window Reply | Add PhotoAdd Photo
 10-09-2007, 11:00 Post: 146667
Normando

TP Contributor

Join Date: Dec 2003
Location: New Hampshire
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 30

3
Filter by User
 Alternator, Battery, Regulator???

Hi Everyone, I have to say electricity is not my strong suite. I have a small electrical problem with my tractor and I'm trying to troubleshoot the problem before I start replacing parts and fixing the wrong problem.

My battery has been kind of weak lately and I have had to jump start my tractor. So yesterday I pulled out the old meter to try to find the problem. Here are some of my findings. Before the tractor is started, I have 12.15 volt at the battery terminals. As soon as I hit the starter is drops down to 6.56 volts. So I jump start it.

Now with the tractor running I get 12.25 volts at the battery terminals (when compared to my truck which has about 14 plus). I put the meter to the back side terminals of the alternator and I get the same results, 12.25v. If I switch on the headlights, the battery volts start to drop and level out at about 9.96 volts. Once the lights are turned off, the volts at the battery slowly start to climb (and I mean slowly) until the reach back to 12.25 volts.

I think it is the alternator but I am not positive. Is there another test or some other way I should have trouble shoot the problem? Oh by the way, I also checked the tension on the alternator belt and it was fine. If it is the alternator, should I or will I have to replace the battery?

Thank you!






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 10-09-2007, 12:16 Post: 146671
Murf

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Dec 1999
Location: Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 7020
 Alternator, Battery, Regulator???

You don't say so, but I'm guessing you're talking about the JD 950 in your profile.

You are correct, the output of the alternator should be about 14 volts.

If it is lower than that I doubt it's the regulator since the job of the regulator is too REDUCE the voltage the alternator puts out to a safe level. If the regulator was shot the voltage should be higher than normal, not lower.

If you have a weak battery, or have installed some large current drawing accessories, you may have over-loaded the alternator and it gave up.

Best way to do it is to take it to a reputable auto electric shop that rebuilds alternators and have them bench test it.

Some of the bigger auto parts houses do this now for free, ask around.

Best of luck.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 10-09-2007, 13:19 Post: 146680
Normando

TP Contributor

Join Date: Dec 2003
Location: New Hampshire
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 30

3
Filter by User
 Alternator, Battery, Regulator???

Thank you for the quick reply and yes it is the JD 950. Yeah that is what I weas planning on doing. Once again Thank you!






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 10-09-2007, 13:58 Post: 146685
AnnBrush



View my Photos

View my Photos  Pics
Join Date: Mar 2004
Location: Troy OH
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 461
 Alternator, Battery, Regulator???

"Before the tractor is started, I have 12.15 volt at the battery terminals. As soon as I hit the starter is drops down to 6.56 volts."

You might want to get the battery tested as well - your statement above indicates a problem with the battery.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 10-09-2007, 14:10 Post: 146690
testing



View my Photos

View my Photos  Pics
Join Date: Oct 2007
Location:
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 2
 Alternator, Battery, Regulator???

How old is the battery?






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 10-09-2007, 18:55 Post: 146705
Normando

TP Contributor

Join Date: Dec 2003
Location: New Hampshire
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 30

3
Filter by User
 Alternator, Battery, Regulator???

About 1 year old.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

 10-09-2007, 20:08 Post: 146712
jd110_1963



Join Date: Feb 2002
Location: westminster, md
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 87
 Alternator, Battery, Regulator???

I would take the regulator along to be tested also. A defective alternator can cause overcharging and undercharging. You also could have a broken wire between alternator and regulator. I would say chances are good the battery will be ok when the charging problem is resolved.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Stumble This

Reply | Pop Up Window Reply | Add PhotoAdd Photo


Page [ 1 ] |

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

Thread 146667 Filter by Poster:
AnnBrush 1 | jd110_1963 1 | Murf 1 | Normando 3 | testing 1 |




Most Viewed

+ John Deere 2210 Backhoe Review
+ John Deere vs Kubota Compact Tractors
+ John Deere 790 fuel shut-off solenoid failing???
+ John Deere low viscosity HY GARD
+ John Deere JD 4100 Wiring diagram
+ JD 790 or Kubota L3000DT
+ Should I buy a John Deere 4105???
+ John Deere 4300 turns over but won't start
+ John Deere 455 garden tractor
+ Oil Change for Diesel Tractor

Most Discussion

+ John Deere 4300 scuffing......
+ Possible Solution To The 4000
+ Dealer out to lunch
+ Just got my new JD 4410 - Prob
+ Hello Green, Goodbye Orange
+ Receiver hitch for iMatch
+ 4300 wheel bolt problems
+ 4000 Ten Series 50 hour break
+ Don't buy JD compact tractors.
+ Oil Change for Diesel Tractor

Newest Topics

+ Oil overflow from tube and Smoke
+ John Deere 4100 gear 3 point not workin
+ 2000 John Deer Gator 4 X2
+ Mini Excavator SY20C - Small Body with Big Power
+ John Deer 1070 starting problem
+ John Deere 990
+ Tractors R Us
+ john deere 4100 with 410 loader hydraulic problem
+ John Deere 2032R Buying advice
+ John Deere 2010 loss of hydraulics













Turbochargers for Tractors and Industrial Machines
Cab Glass for Tractors and Industrial Machines

Alternators for Tractors and Industrial Machines
Radiators for Tractors and Industrial Machines

Driveline Components for Tractors and Industrial Machines
Starter Motors for Tractors and Industrial Machines