Complete Wiring Diagram for 2012 Dodge Charger Police Package Electrical Systems

Begin your troubleshooting by isolating the fuse box C1 located beneath the driver-side dashboard panel. The full-color schematic labels this cluster as Power Distribution Center, where fuses F22 (10A), F34 (15A), and F41 (20A) control critical circuits for the light bar interface, auxiliary power outlets, and rear camera module, respectively. Verify continuity across these fuses using a multimeter set to 200Ω–a reading above 0.3Ω indicates corrosion or a compromised connection requiring immediate replacement of terminals with gold-plated spade connectors.

Trace the main harness from the PCM (Powertrain Control Module) to the under-hood auxiliary relay box along the passenger-side firewall. The 16-pin weatherproof connector (terminals A3–A6) carries switched 12V to the siren amplifier and emergency lighting controller. Use a back-probe pin on terminal A5 to confirm voltage delivery during key-on-engine-off (KOEO)–expect 11.8–12.6V. Deviations below 11.5V suggest a parasitic draw from the auxiliary battery isolator or degraded ground at G101 (chassis mount near the left rear wheel well).

For the data link connector (DLC), focus on pins 6 (CAN-H) and 14 (CAN-L). These carry 500 kbps communication for the vehicle stability control and automatic license plate recognition systems. Probe each pin with an oscilloscope to detect signal corruption–valid waveforms should display 2.5V nominal with ±1V peaks. Absence of signal on either line mandates replacement of the twisted-pair wiring from the DLC to the central gateway module, ensuring a minimum bend radius of 5× cable diameter to prevent attenuation.

When addressing the rear decklid sensor cluster, prioritize the 4-way connector (terminals C1–C4). Terminal C2 supplies constant 12V to the backup camera–verify this with a non-contact voltage tester before disconnecting. Terminal C3, a ground return, must maintain resistance to the chassis. If resistance exceeds this threshold, strip the terminal, apply oxidation-inhibiting compound (e.g., CRC Corrosion Inhibitor), and re-crimp using AWG 14 tinned copper wire.

Electrical Schematic Analysis for Law Enforcement Sedan Variants

Begin diagnostics by isolating the auxiliary fuse box beneath the dashboard–labelled “C25” on revision G schematics. This cluster controls the pursuit-mode relay, emergency lighting feeds, and multi-band radio integration. Use a multimeter set to 20V DC to verify power at pin 12 of the 32-pin connector; expected readings should stabilize between 11.8–12.2 volts during ignition-on states. Deviations below 10.5V suggest parasitic draws from the siren amplifier or faulty alternator diode trio.

Trace the heavy-gauge orange wire from the under-hood distribution block to the battery disconnect solenoid. This 4 AWG conductor carries 180A continuous and is prone to heat-induced insulation failure near the front strut tower. Scrape insulation back ¼ inch, apply dielectric grease, and crimp a new ring terminal if resistance exceeds 0.3 ohms. Adjacent 14-gauge yellow/black striped circuits feed the dashboard annunciators–intermittent shorts here manifest as false warning lights during high-load scenarios like spotlight activation.

Radio Interface Harness Pinout

Locate the 16-pin METRA connector behind the center console. Pin 5 (white/blue) delivers 7.2V to the external speaker array; Pin 8 (gray) carries the microphone hot signal with 1.2kΩ impedance. Techs frequently overlook the gray/black ground return at Pin 10–verify continuity to chassis using a 1Ω scale; corrosion here mimics microphone failure. For encrypted comms upgrades, splice the blue/red wire at Pin 13 directly into the aftermarket encryption bridge; avoid daisy-chaining through the existing radio harness as voltage drop may corrupt AES-256 handshakes.

Check the trunk-mounted power distribution module for aftermarket additions. The violet wire from the 50A breaker feeds the rear-facing hideaways–resistance above 0.5 ohms necessitates rerouting through a new 6 AWG run from the main battery. For next-gen dashcam integration, utilize the pre-wired purple/white wire at Pin 3 of the OBD-II port; this line remains live during cranking and avoids the CAN bus sleep delays inherent in the orange/black ignition-switched circuit.

Finding Critical Electrical Connections in the Sedan’s Law Enforcement Variant

Start beneath the driver’s side dashboard by removing the lower trim panel secured with three 7mm bolts. The fuse box cover, marked with a schematic, reveals the primary power distribution hub–label each relay slot (R1-R14) before disconnecting. Trace the thick red cable from the battery positive terminal to the main fuse block under the hood; this feeds the auxiliary circuits unique to fleet models.

• Locate the TIPM (Totally Integrated Power Module) in the engine bay–its black plastic casing houses relays for high-draw systems like emergency lighting. Use a multimeter to verify 12V at pin 30 (fused ignition input) before probing further.
• The auxiliary control module (ACM) sits behind the glove box, accessed after removing four Torx-15 screws. Its 68-pin connector splits signals for sirens, spotlights, and data recording–identify pins 4 (ground reference) and 12 (switched output) for troubleshooting.
• For overhead console wiring, peel back the headliner near the rearview mirror to expose a 12-wire harness. Purple/white striped wires (pins 7-9) carry voltage for the microphone and emergency lighting trigger.

Check the brake pedal position switch’s pigtail–a frequent failure point in pursuit-rated variants. The switch’s 4-pin connector (gray housing) should show continuity between pins A and B when depressed. Behind the instrument cluster, a 24-pin connector routes signals for the speedometer calibration; pins 20-23 carry the Vehicle Speed Sensor (VSS) output critical for traction control tuning.

In the trunk, the siren control box mounts to the left wheel well. Its harness branches into three sub-connections:

1. Main power: Red wire (fused at 20A) from the under-hood relay.
2. Light bar interface: Blue/white wires (pins 5 & 6) pairing with the front grille and rear deck lid output.
3. Emergency disable: Black/yellow (pin 8) grounding circuit requiring isolation if unintended activation occurs.

Verify the EVIC (Electronic Vehicle Information Center) wiring by accessing the radio harness through the center console. Yellow/black wires at connector C2 feed the GPS antenna–test for 5V signal strength if navigation fails. For alternator diagnostics, probe the single-wire voltage regulator (blue connector) at the rear–it should read battery voltage ±0.5V during normal operation.

Use a non-contact infrared thermometer to scan connector terminals after reassembly. Hotspots (>120°F) indicate resistance–re-crimp suspect terminals with silver-plated copper splice connectors. Label all harness branches with heat-shrink tubing markers; color-coding follows the SAE J1128 standard (e.g., pink: 4A fused circuits). Store removed panels with hardware in sequence-labeled bags to prevent cross-threading during reinstallation.

Step-by-Step Guide to Tracing the Law Enforcement Sedan’s Electrical Conduit

Locate the primary power distribution module under the driver-side dashboard–adjacent to the fuse block. Remove the plastic cover (two 8mm bolts) to expose the harness bundle. Identify the thick red cable (battery positive) and trace its path toward the rear of the vehicle using a 12V test light. Connect the test light’s ground clip to a known chassis ground (bare metal on the firewall) and probe each terminal along the route. Record voltage drops exceeding 0.2V, as these indicate corrosion, loose terminals, or insufficient gauge wire at junctions.

Harness Section	Wire Color (Gauge)	Pinout Location	Expected Voltage
Emergency lighting feed	Yellow (10 AWG)	C2 pin 17 (black 60-pin connector)	13.8–14.2V
Sirens/radar relay	Orange/black (12 AWG)	F1 pin 3 (fuse block)	12.0V (switched)
Auxiliary fuse panel	Red/white (8 AWG)	Battery junction post	12.6V (unswitched)

Isolate the suspect circuit by disconnecting the harness at the bulkhead connector–label each pin with masking tape before separation. Use a multimeter in continuity mode to verify integrity between the dashboard-side and body-side connectors. Replace any wires showing infinite resistance or burning odor. Reassemble in reverse order, applying dielectric grease to terminals to prevent moisture ingress. Recheck voltage at the emergency lighting module with the ignition on; a drop below 13.5V suggests a faulty alternator or undersized ground strap (minimum 4 AWG copper).

Locating Fuse Panel Hookups for Aftermarket Law Enforcement Gear

Trace the under-dash fuse block beneath the left-side kick panel. Pinpoint slots labeled “B+ Aux” or “Switched 12V” – typically positions 22, 28, and 45. Verify fuse ratings (20A for lighting circuits, 30A for heavier accessories) before connecting external strobes, radios, or data terminals. Use a multimeter to confirm live voltage on both terminals when the ignition is turned to RUN.

Mapping Circuit Paths to Avoid Overloading

Study the vehicle-specific fuse legend attached to the panel door for amperage thresholds. Connect auxiliary load wiring exclusively to dedicated accessory circuits, steering clear of shared ECU or ABS fuses. Route power cables through the firewall grommet adjacent to the brake booster to prevent chafing against sharp metal edges. Secure all connections with nylon zip ties spaced every 6 inches along the harness path.

Label every tapped circuit with heat-shrink tubing marked in white (primary power) or yellow (switched outputs) using a fine-tip permanent marker. Test each connection under full load for 10 minutes before finalizing installation – observe for heat buildup at crimp points, which indicates insufficient gauge size or poor termination. Replace any suspect fuse with the same type (mini blade, not ATO) to maintain fault protection integrity.