Charging battery

   / Charging battery #1  

duck76073

New member
Joined
May 7, 2022
Messages
3
Tractor
kioti
Battery will not charge on vehicle. Removed battery and put on bench charges ok. Charging on vehicle the negative post gets extremely hot and discharge the battery. Help
 
   / Charging battery #2  
Sounds like a poor or high resistance ground while on vehicle - maybe.
 
   / Charging battery #3  
Check your engine ground.
 
   / Charging battery #4  
If the post gets hot, it is probably a dirty connection on the post.
 
   / Charging battery #5  
Probably your negative ground, but I'd check the ignition switch, too.

My 2025R had a small electrical leak in the starter relay that cooked the ignition switch and caused corrosion on both battery terminals.
 
   / Charging battery
  • Thread Starter
#6  
Thanks a lot for all the comments
 
   / Charging battery
  • Thread Starter
#7  
The battery is on my Chevy pickup. The charger negative terminal is what gets hot and shows to be discharging after 30 minutes.
 
   / Charging battery #8  
Voltmeter? Battery should be 12.5 0r so and should be 13+ when runnimg. Leave your battery un hooked for a while and see if it holds a charge. 12.87 is what my meter reads on a good battery. It should be the same, hours later.

Don't disconnect battery while engine is running on the newer vehicles. That's a no no. Old ones it's okay to do that, new ones not. By old ones I mean before fuel injection.
 

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