M939 Power Control Box (PCB)
These are used but tested good Power Control Boxes, sometimes referred to as a PCB or black box. This box is responsible for making sure you only start your truck once by not allowing you to send power to the starter when the truck is already running.
When they go bad one, or all of these three things can happen:
- Truck won't start
- Truck won't have any lights
- Truck won't have any working gauges
What's in the box?
- One used but good power control box