We have a Yale mpb040-en24t2748 24V electric pallet jack that gives me an error whenever I connect it to the charger. It initially goes through the 3 LED test pattern and then the solid yellow LED comes on, as if it is charging.

About 30 seconds later the red LED starts blinking, although the yellow LED remains on. According to the troubleshooting guide on the top door of the jack, this means that there is no current output.

I have verified that all 4 of the batteries have the proper water level and the electrolite reading in several cells that I tested is within normal range. The batteries are less than 1.5 years old.

The system is showing 24V at the plug to the motor. Do I have a bad charger or is there anything else I can check?

I know it is not supposed to charge if the system is already showing 24V but I would not think an error would appear. When I was originally alerted to a problem with the jack the entire system was only reading 3.1V. I had to do a bit of temporary rewiring and connect a 12V car charger to recharge two batteries at a time to get the system back up to 24V.