michaelbuck
New member
- Joined
- Nov 17, 2021
- Messages
- 8
- Tractor
- Mahindra 2638
All lead acid batteries have the following voltage after they have rested (have not been charged or loaded in 30 minutes)Noticed trailer brakes are weak.
Battery box says “recharge” on battery, but battery is only 2 months old and electrical tester reads 12.4V
Brakes work, but don’t do a lot, even with brake controller fully cranked to 10.
The trailer is only a year old and brakes worked well when I first got it.
What should I start looking at? Wiring connections seem fine
Fully charged =12.78Volts
3/4 full = 12.50
1/2 full = 12.25 Do not use battery here for any length of time otherwise damage to cells internally.
So rull of thumb for every 1/4 volt the battery drops the battery also drops 1/4
Rememeber 12.75,12.50,12.25 those are easy to remember.
A charging battery should be roughly 13.0 to 14.0 volts during charge.With engine on measure across terminals.Anything less is either bad connections,bad battery or alternator/regulator