When you hot wired... did you have a direct 12v DC power source direct to the slide motor wires, i.e., you eliminated the fuses, circuit breakers, etc? If yes, I'd say it your slide motor. Did you hear any hum from the motor, e.g., if the gear was stuck and didn't allow the motor to turn?
Based on your answers.. maybe we can go down other paths?
2021 Precept 34G, Brevard, NC