yes Steve_h, but first you absolutly owe it to yourself to insure the battery is NOT the problem, there are safety reasons the truck goes into lockout that you really don't want to experience.
To check the battery, you must take readings from the battery itself and the frame of the truck (post them here, if there is NOT a problem with your battery that needs to be fixed first, we will tell you further how to adjust or bypass the Curtis BDI box)
The first reading is "battery voltage at rest", then battery voltage under load. (run the lift hydraulics to max and stall 3 seconds and read voltage at battery cables) then each cable of the battery to frame of truck in ohms, then each cell's voltage, then each cell's specific gravity (hydrometer reading).