7 main power circuit troubleshooting, Unit will not power up from ground control, Overview of procedure – JLG 15VPSP Service Manual User Manual

Page 67: Check for these obvious conditions first, Battery voltage 24 volts. (fully charge batteries), Battery connections clean and tight, Key switch positioned to ground (grnd) control, Emergency stop switch pulled out. (reset position), Main power circuit troubleshooting -13, Unit will not power up from ground control -13