Has anyone had this problem occur during a Prolong Discharge?....

I'm doing my third annual Prolong hybrid battery reconditioning, since I started the routine
around 2017 or 18..... I have a Gen II Prius.

Followed all directions, as usual, to the letter, from a detailed checklist I made
when I purchased the kit (disconnect 12v, wait times, 4-6 hour overcharging, etc.)

I started out, as always, topping off the battery and balancing with the charger.

Then I discharged to the recommended 1st level of 134 volts. Went well, as per the
two previous years.

Hooked up and recharged and balanced with the charger again.

Switched over to the discharger again. Set to the 2nd level of 84 volts.

I left to walk my dog in the park, and when I came back 1/2 hour later, found the discharger
beeping, the green idle light on, and the voltage indicator reading 000 volts, and the current
indicator reading zeros as well. It usually takes up to a day to lower the voltage.

I turned off, and then on the discharger to see if some simple issue might be present, but the
problem persists - the volt window reads zero volts and the current window reads zeros as well.

I don't know what to think of this problem, is it a battery issue or the rehab kit?....

I'm hoping for some advice before I have to start ripping the back of the car apart....

Thanks,

 

Thanks for the steer guys. Turns out it was just the internal fuse in the discharger after all.
Called HA, and after 2 days and about a half dozen attempts, finally got a return phone call from them. Apparently they are short staffed now and swamped, but once the guy called me back he was very helpful.
You have to open the casing to access the fuse, but it's straight forward from there, and can use a 2 amp in place of the factory installed 1.5 A. Just make sure you use a fast-blow.
After that, the reconditioning finished up without a hitch.

As far as measuring the battery voltage, you can either use your multimeter on the batt's buss terminal, or if you have your Prolong wiring harness wired in, check voltage between pins 1 and 4, or you can cheat by simply hooking your charger back up to it and switch it on for a few seconds and read the charging display off of that.

If your charging harness is dead, or your charger reads zero when it worked before, you may have to pull the cover plates off the hybrid battery and check the fuse at the base of the harness where you hooked it up to the battery. It has a slow-blow there.
If those are all good, you need to start checking out your battery....