Inspect for obvious shipping damage
Clean both inside and outside so as near-new in appearance as possible.
Diagnois & test to determine the cause of failure.
Inspect printed circuit boards for defects including cracks, burns, corrosion or broken circuitry.
Look for potential issues that could occur.
Test components for proper values.
Repair necessary parts to put your fence charger in top operating condition.
Replace all missing components, wing nuts washers, knobs etc.
Re-test fence charger to ensure it meets or exceeds factory specifications.
Run in each fence charger to ensure proper operation.
Properly package fence charger to prevent damage in return shipping.