Originally Posted by Jonol
Your right full battery will be 12.7 volts but if you check with the charger on, and the
battery is completely full charge, you will have 14.6 volts.
Still check all the ground on the system.
The factory never removed the paint before they install the motor or the ground wires to the frame.
If you are reading anything greater than 12.6 to 12.7 volts across the battery terminals then you are not reading battery voltage ----you are reading charger output voltage which should be 14.6 or 14.7.
Unhook the negative terminal and read across the battery terminals, as mentioned above resting battery voltage should be 12.6. More accurate is a specific gravity test.
I would tend to believe you have system voltage drop due to high resistance somewhere in your leveling system wiring, ground points are usually the typical culprit but not always. All terminals should be clean and tightly clamped. You should not be able to wiggle any wire termination.
If all this has been checked then your battery does not have the capacity to deliver the amount of current required by the leveling system. Do you know the dc current required to make the leveling system function properly? Is it within manufacturers specifications? If so then the likely problem is a defective battery - or - the battery is not sized properly to deliver the dc current required by the leveling system.