electrical problems installing digital volt guage

[lvandyke]

2001 TXT Sepex / PDS- 36volt
So I bought 2 hole plate and digital volt meter to install in dash- jumpered + from meter to key switch for on/off control of meter- worked fine for testing, came on & off w/ key switch on/off. I put it all together in dash- nothing. key switch seems dead, f/r switch silent, then noticed I did not put in tow before working. took jumper off key switch but still nothing.
is key switch fried? did I toast the cart? about to order new key switch. battery reads 36.7volts at terminals of all six combined. took off cover on charger port- reads 36.7 for pack voltage and looks good. oh...and now I have it in tow/maintenance.
tried for reading at key switch but nothing now. suggestions from here are appreciated.