Axon Fleet 3 & 12 Volt Troubleshooting

Battery feeds, fuse ratings, auxiliary power, load-shed behavior, and power distribution.

Key-on sources, delayed-accessory circuits, blunt-cut leads, and relay requirements.

Approved grounds, network cautions, body modules, and circuits that must not be tapped.

Harness routing, airbag clearance, pass-throughs, weather sealing, and service access.

• Constant 12V: Battery feed at the underhood fuse block and the auxiliary battery (when equipped) — use the upfitter-provided junction blocks/ studs, not the battery post directly.
• Ignition: Blunt-cut ignition leads in the police package harness (IP area) and RAP (Retained Accessory Power) circuits — verify key-on/delay behavior with a meter.
• Ground: Body/chassis ground studs and harness ground blocks (G-blocks) — use the documented ground points, never paint-anchored screws.
• Brake wire: Brown/yellow in the police package wiring — located either at the rear of the vehicle or at the center console; confirm polarity with a meter before connecting brake-triggered equipment.

• Constant 12V: Battery and PDC (power distribution center) feeds — use the upfitter taps and studs provided in the police package.
• Ignition: Ignition/blunt-cut leads from the police upfitter harness (steering column / IP area) — note that with push-button start, ignition state may be relay-controlled.
• Ground: Dedicated chassis ground points and ground studs specified in the body builder guide — keep grounds on bare metal with the supplied hardware.
• Brake wire: Green/orange at pin 4 of the 24-pin white plug on the ViSM module behind the rear passenger seat; confirm the signal with a meter before tapping.

• Constant 12V: Upfitter junction block and battery feeds in the police power distribution — use the auxiliary fuse panel provided with the police package.
• Ignition: Police package accessory/ignition circuits (the Interceptor uses a starter-fed system; ignition is typically provided through upfitter relay control) — verify with the modifier guide and a meter.
• Ground: Body ground studs and dedicated upfitter ground points listed in the modifier guide — avoid the battery management system circuits.
• Brake wire: Gray/brown at pin 8 in the white connector in the center console; confirm the state change with a meter before connecting.

• Brake wire: Light green wire in the driver's sill plate (kick-panel area at the door sill).
• Verify: Meter the circuit pedal-up vs pedal-down to confirm polarity before tapping.

• Brake wire: White/green wire in the driver's sill plate.
• Verify: Confirm the state change with a meter — some Ram brake circuits are CAN-reported.

• Brake wire: Gray/orange wire at the black plug in the passenger kick panel.
• Verify: Colors can change by model year — meter the plug pins before connecting.

• Brake wire: White/blue wire at the BCM green plug.
• Verify: The BCM circuit may be CAN-related — confirm the signal with a meter before tapping.