TXT 48V New batteries, Strange controller issue

[nickdalzell1]

This one has me stumped. TXT 48V, came in from a construction site and they had hacked into their main harness to install lights, backup alarms, and a horn. They fried their speed controller.

I replaced the harness, and pedal group harness (seen these cause issues before so i wanted to rule it out), controller, solenoid (old one was melted), pre-charge resistor, ensured batteries had sufficient charge (is load testing good with a snap-on load tester/analyser, reading 50.2V at pack and 46.4 the B+ and CB- controller leads)

With everything hooked up and car put into RUN, the Curtis 1313 handheld powers on, but then goes blank. Figuring that was odd, like car had shut down, I flipped the F/R into reverse and back to RUN, and soon as the handheld goes dead, so does the backup beeper.

Someone at EZGO suggested i put AA batteries into the handheld and try again. Sure enough, (never knew that feature existed) the thing powers up and i can read the faults. Low Battery voltage it says. Now here is the odd part. I read 50.2 at the pack, and after the solenoid (after the resistor too) i was getting 46.4, but under the monitor tab on the handheld, it shows the battery voltage as 9.7 V

That's not correct!

I figured the controller was bad in box so i tried two others, only to get different but still extremely low readings. 10.9 and 11 V respectively. Has FSIP sent me three faulty rebuilds?

EDIT: Ignore everything! turns out there's a red wire that's usually hooked to one of the large terminals of the solenoid, and i had it on the wrong large terminal. Put it on battery side where the cable goes to B+ at the pack and now the monitor reads 48.7V and car runs fine.