Hi, first post here. our clark npr17 reach truck wont move forward or in reverse. motor runs when stepping on brake but stops after a few seconds. The battery is weak but the lift, reach and tilt functions normally. Found an inline fuse under the top cover and replaced it but still no movement. Parking brake is working and I can hear the switch on it work. Is there something easy to check? Any help please. The display now reads -48 when joystick is moved either forward or reverse.