[JohnnieB]

Welcome to BGW!

If you only get one set of 4 beeps and then silence, when you first put it into diagnostic mode, the controller is just telling you it is in Freedom Mode.

The error codes are a repeating sequence. IE: Beep - Pause - Beep-Beep-Beep. Then it repeats a few moments later.

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There are 3 large terminals on top of a PDS controller. 2 tall ones and a shorter one one the driver's side. They are labeled on the drawing at the top of the attached schematic.

If you were measure between the two tall ones (B+ and B-), you should get a few volts less than the battery pack voltage when the pedal is up and exactly the same as the battery pack voltage when the pedal is pressed just far enough for the solenoid to click.

Again, if you were measuring between the two tall terminals, and the voltage dropped to 25V when the wheels were spinning in the air, you either have some serious cable/connection issues or the new batteries are not charged.

What is the battery pack voltage when measured after the batteries have sit for about 12 hours after the charger shuts off automatically?
Should be 38.2V, probably a bit higher since they are new.

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What make/model Batteries do you have?
What make/model Charger?