Hi,
I bought a 36 volt golf kart a few years ago
for $250. The owner put new trojan t-105's
in it and it never worked. The charger worked
and the batteries were up to full charge but it
would not go.
I paid him the money and went to get my trailer.
I got the trailer ready to load and fiddled with a diode
on one of the solenoids and drove it onto the trailer.
It was the old mechanical control stuff but for 6 new
batteries and maybe an upgrade for the electronics I
thought it was worth it. ( The guy was almost crying
when I pulled away.)
Anyhow maybe a bad connection somewhere?