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Case

J

Ji Case 35172

Member
I have a Case Sc it is a really good tractor but you only get a certain amount of starts out of it before you have to charge the battery but when I put it in the charger it says it is charged so I took out my voltage meter and checked and it said that the battery was charged also. I checked every centimeter of that tractor to see if there is a short somewhere and there isn't I don't have lights on it so I don't know what is going on. Thanks for any help
 
Check the voltage while it is cranking, it will give you the voltage drop and you'll you a better idea of what's happening.
 
Is your charging system working as it should? if so I would bet on a bad battery, they can read the correct volts when sitting but have no reserve amperage to keep cranking,, I have also seen starters needing repair that draw way too much juice, also does it crank fine if you boost it? Bad grounds and or connections bad starter switch ect. I am assuming you are still using a 6 volt system,, few ideas I am sure others will add to the list of possible problems
cnt
 
Your voltage cutout is rated for a 6 volt system, how will you ever charge an eight volt battery to full when the cutout is made for six?

Friends 420 John Deere had same issues. Battery voltage remained the same, tractor running or not with an 8 volt. I gave him an one year old 6volt battery to try and that solved the issue.

Beagle
 
I agree the system needs a running voltage check, I have used 8 volt batteries in a six volt system but I had to make sure the regulator was adjusted up to 7.5 or 8 volts, if yours is cutting out at 6.5 or so it is not charging long enough to keep the 8 volt where it needs to be to keep the battery in a good state of charge, your regulator may be adjustable
cnt
 
Thanks didn't think I had to do that because I had a Ford 8n with a 6 volt system and an 8 volt battery and charged just fine but I will do that.
 
When in college, we were told to view a battery as a constant voltage source and a variable resistor, with the resistance increasing as the battery lost or was unable to maintain charge. So if you measure voltage with no load on the battery, there is no current through the internal resistor component, and the battery reads the rated voltage at the terminals. However if you are cranking the engine, the starter is drawing significant current through the internal resistor in your model, so the voltage at the terminals drops. That is why you have to measure the battery voltage under load.
 
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