1. Main ON/OFF switch not activated when the key switch was turned ON.
2. Low voltage to the traction power amplifier (especially while lifting or driving)
due to over-current or short-circuit.
a. Try a known-good battery.
3. PTC R1 missing, faulty, or tripped (should be 18 ohms).
Note: A very high resistance is possible due to excessive current while the main
contactor is open. It should automatically recover.
a. Carefully check to see if R1 is hot (tripped). If so, unplug the battery and
allow it to cool. Locate the low impedance path that tripped R1 and correct.
4. Check the K30 Relay.
5. Wire #24 near 0V.
a. Check that J5 is connected, check the fuse, and check the wiring.
6. Check for Shorts to frame.
a. Check for 24V at J5-16.
7. Short or open circuit in the CAN wiring, or electrical noise in the CAN wiring
due to a bad connection or outside interference, both at power-on.
a. Check the CAN wiring.
8. Faulty traction power amplifier.
a. Check the power wiring.