Detailed technical documentation and installation sheets are available through FSIP Electronics Cloud Electric Further Exploration Review the Curtis 1510(A) Installation Sheet
: Positive battery supply. This terminal also connects to one side of the Main Solenoid . B- : Negative battery supply. M- : Output to the motor armature ( A1 ). curtis 1510a-5250 wiring diagram
Simply leave Pin 10 disconnected. Tape the end of the brown wire to prevent shorting to chassis. M- : Output to the motor armature ( A1 )
| Pin # | Signal Name | Description | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | | KSI (Key Switch Input) | 48V from keyswitch/tow-run switch | Red | | 2 | Pot Low (Return) | Ground for throttle potentiometer (0V) | Black/White | | 3 | Pot Wiper | Variable 0-5V throttle signal | Green | | 4 | Pot High | 5V reference output to throttle (regulated) | White | | 5 | Reverse Switch Input | 48V to activate reverse buzzer & reverse speed curve | Orange | | 6 | Stop Switch Input (Brake) | Normally open (48V when brake pressed) – used for HPD | Dark Green | | 7 | Interlock / Fwd-Return | B- ground for forward direction (completes circuit) | Blue/White | | 8 | Interlock / Rev-Return | B- ground for reverse direction | Gray | | 9 | Main Contactor (Solenoid) Driver | Output to solenoid coil (B- signal) | Yellow | | 10 | Reverse Buzzer Output | 48V output to sound alarm | Brown | | Pin # | Signal Name | Description
: Resistance across the small terminals must be no less than 100Ω . Troubleshooting "No Movement"
| Blinks | Fault | Likely Cause | | :--- | :--- | :--- | | | No fault | Normal operation | | 2 | HPD (High Pedal Disable) | Throttle not at zero during power-up | | 3 | Undervoltage | Battery < 18V during operation | | 4 | Overvoltage | Battery > 32V (regeneration spike) | | 5 | Main Contactor Welded | Voltage present at M- before contactor closes | | 6 | Throttle Potentiometer Open | Pin 3 voltage out of range (<0.3V or >4.8V) | | 7 | FET Short | Motor runaway condition | | 8 | Temperature Fault | Heatsink > 85°C | | 9 | Interlock Active | Pin 9 open (bumper switch engaged) |
Report compiled for maintenance engineering use. Always verify wire colors against the specific OEM vehicle diagram, as variations exist.