The first thing one notices when unfolding a CenCom Gold diagram is that it doesn't look like a standard automotive wiring chart. Traditional automotive diagrams are often linear—power flows from point A to point B. The CenCom Gold, however, operates on a star topology.
The diagram centers around the "Main Control Unit." Radiating outward are connections to the "Sapphire" lightbar, the siren speaker, the control head (the box with buttons inside the cabin), and various peripheral switches. The diagram teaches you that the system is not just a collection of wires; it is a data network. Understanding the difference between the High Current Outputs (for lights and sirens) and the Low Current Logic Inputs (for triggers like "air horn" or "gun lock") is the first lesson the diagram offers.
The crown jewel of the CenCom system is often the Whelen Sapphire lightbar. The wiring diagram for this connection is a lesson in efficiency. Rather than running dozens of individual wires for every light bulb, the CenCom Gold diagram illustrates a multi-conductor cable system.
This section of the diagram is often the most intimidating. It details how the control head communicates with the bar to activate specific modes (Mode 1, Mode 2, Take Down, Alley Lights). It’s a perfect example of multiplexing—sending multiple signals over fewer wires. Reading this part of the diagram allows an installer to diagnose whether a broken alley light is a burnt bulb or a severed control wire.
If the unit is dead and causing a no-start condition:
While official PDF diagrams for the legacy Whelen CenCom Gold system are increasingly rare, the system's wiring is centered around its Amplifier/Relay Module (ARM), which uses accessible external fuses and several multi-pin connectors. Core Wiring Components
The CenCom Gold system is typically wired using a standard set of connectors:
Main Power: Heavy-duty Anderson-type connectors handle the high-current input.
Control Head: Connects to the ARM via a single 8-conductor, 22-gauge cable. Outputs: The module features multiple fused outputs: Slide Switch: One 40-amp and two 20-amp outputs.
Programmable Buttons: Five 10-amp outputs and additional auxiliary switches.
Siren/Audio: Standard 2-pin siren output for one or two 100-watt speakers. Connector Identification
Replacement kits and common used units often include these specific plugs:
9-Pin Output: Used for 10-amp lighting and accessory outputs.
12-Pin Accessory: Dedicated for secondary inputs and control signals.
4-Pin Accessory: General input/output for smaller auxiliary devices. cencom gold wiring diagram
2-Pin Power/Ground: Secondary low-current power for the siren logic. ### Programming & Support
Software: The system requires Windows-based software (compatible with Windows XP through 10) for configuring button behaviors and siren tones. It connects to a PC via a standard USB port located directly on the ARM module.
Manuals: You can attempt to search for specific archived manuals by form number or product code on the Whelen Install Guides page.
Replacement Parts: Since this is a legacy unit, individual wire harnesses and pin kits are often sourced from specialized retailers like Emergency Supply providers or auction sites like eBay. Install Guides - Whelen Engineering
Whelen CenCom Gold is a legacy siren and light control system designed for emergency vehicle upfitting. While it is an older unit, its primary "helpful feature" is its high degree of programmability
, allowing users to customize nearly any button to control specific outputs, sirens, or patterns. eLightbars Key Features of CenCom Gold Programmable Interface
: Includes an 18-button control head with a four-position slide switch (one 40-amp and two 20-amp outputs). Tactile Feedback
: Features membrane switches with a solid rubber overlay for moisture resistance, providing physical feedback during use. High Output Capacity
: The amp/relay module supports 6 high-current outputs (up to 60 amps total) and 16 low-current outputs. Backlit Buttons
: All buttons are backlit for nighttime visibility and come with an LED indicator to show active modes. Wiring & Support
Because this is a legacy product, finding official parts or diagrams can be difficult. Many connections utilize standard AMP connectors , which can be custom-built using parts from retailers like
if you have the proper crimping tools. For official documentation, you can browse Whelen's Install Guides or join community forums like eLightbars for peer-to-peer troubleshooting. eLightbars specific pinout for the control head, or do you need help programming a custom light pattern? Install Guides - Whelen Engineering
* Lightbars. See All. * Lightheads. See All. See All. * See All. See All. * Specialty Products. See All. * Beacons. See All. Whelen Engineering Whelen Cencom Gold wiring options?
The CenCom Gold wiring diagram maps out the critical electrical connections required to operate Whelen's legacy emergency light and siren management system. The first thing one notices when unfolding a
Understanding this diagram ensures that police, fire, and rescue vehicles have fully functional sirens, lightbars, and auxiliary equipment. This guide breaks down the core sections of the CenCom Gold system, its primary wire clusters, and critical installation safety rules. ⚡ System Overview and Power Requirements
The Whelen CenCom Gold consists of a user-facing control head and a remote Amplifier Relay Module (ARM) usually mounted in the trunk or under a seat. Because the ARM handles high-amperage switching, the power layout is the most critical part of the diagram.
Main Power Input: Heavy-gauge red wires connect directly to the positive battery terminal or a high-amp distribution block.
System Ground: Heavy-gauge black wires must be routed to the vehicle chassis or negative battery post.
Ignition Sense: A smaller wire (often orange or yellow) ties to a switched ignition source to prevent battery drain. 🚨 Wire Harness Breakdown
The physical CenCom Gold unit separates connections into distinct physical plugs or blocks. Splicing them correctly dictates the function of every switch on your control head. 1. Siren and Audio Output
This section governs the auditory warning devices of the vehicle.
Speaker Lines: Typically a pair of brown wires routed directly to the siren speaker (supports one or two 100-watt speakers).
Radio Rebroadcast: Two wires that tap into the vehicle's two-way mobile radio to broadcast incoming radio traffic over the siren speaker. 2. High-Current Outputs
These wires control heavy-load accessories like halogen rotators, large scene lights, or full-size lightbars.
Heavy-load relays generally provide fused power up to 10 or 20 Amps per circuit.
Follow the diagram strictly to match the amperage draw of your specific lightheads to the correct output wire gauge. 3. Low-Current Outputs
These are designed for smaller LED perimeter lights, grille lights, or triggers for secondary relays. Often rated around 2 Amps per line.
Using these for high-draw halogen or strobe power supplies will blow internal fuses or damage the ARM. 4. Logic and Analog Inputs While specific model variations exist (e
Inputs allow external vehicle triggers to change how the CenCom behaves automatically.
Horn Ring Transfer: A wire spliced into the factory horn wire, allowing the driver to change siren tones by pressing the steering wheel.
Park Kill: Tied to the gear shifter or parking brake to automatically shut off specific lights or sirens when the vehicle is in park. 🛠️ Best Practices for CenCom Gold Installation
Wiring a complex emergency vehicle system requires precision to prevent electrical fires and ensure reliability in life-or-death situations.
Use Waterproof Connectors: Whelen strongly advises using heat-shrink or waterproof butt splices for any connections made outside the climate-controlled cabin.
Check the Fuse Ratings: Never replace a blown fuse on the ARM with a higher-rated fuse. Match the diagram's specified amperage exactly.
Control Head Cable Care: The 8-conductor cable connecting the keypad to the brain carries low-voltage data. Avoid kinking this cable or running it alongside high-amperage power lines to prevent signal interference.
Consult the Official Manual: Because wire colors and pinouts can shift slightly depending on the specific manufacturing year and sub-model (such as those with or without built-in Traffic Advisors), always reference the official physical document from the Whelen Install Guides Database whenever possible.
If you are looking to finish your build or troubleshoot a specific pin on your module, let me know: Are you wiring a Traffic Advisor with this setup?
While specific model variations exist (e.g., CENCOM Gold GEM series), most diagrams share a common layout of terminal blocks. Below is a generalized breakdown of the typical terminal designations found on a CENCOM Gold wiring schematic.
| Terminal | Label | Typical Function | Wiring Notes | | :--- | :--- | :--- | :--- | | 1 | AC | 16.5V AC Input | Connect to a dedicated 40VA transformer. Do not use DC here. | | 2 | AC | 16.5V AC Input (Return) | Polarity does not matter for AC terminals. | | 3 | BELL+ | Siren / Bell Positive | Provides 12VDC for external sounders (current limited). | | 4 | BELL- | Siren / Bell Negative | Common ground for alarm output. | | 5 | AUX+ | Auxiliary Power (12VDC) | For powering PIRs, glassbreaks, or keypads (rated ~500mA-1A). | | 6 | AUX- | Common Negative (Ground) | Reference ground for all DC devices. | | 7 | Z1 | Zone 1 Input (Normally Closed) | Loop to Aux- via contact or EOL resistor (1k–2.2k typical). | | 8 | Z2 | Zone 2 Input | Same configuration as Z1. | | 9 | T | Tip (Phone Line – Ringing side) | Connects to Telco’s Red/Green pair. | | 10 | R | Ring (Phone Line – Ground side) | Standard RJ31X jack wiring: Red to T, Green to R. | | 11 | T1 | Tip to Premises (House Phones) | Connects to the “Tip” side of internal house wiring. | | 12 | R1 | Ring to Premises | Connects to the “Ring” side of internal house wiring. | | 13 | PGM | Programmable Output | Switched ground for strobes, resetting smoke detectors, etc. | | 14 | GND | Earth Ground | Critical for lightning protection; connect to cold water pipe or ground rod. |
Now that you understand the pinout, let’s walk through a real-world installation of a Cencom Gold in a typical police interceptor (Ford Police Interceptor Utility or Chevrolet Tahoe PPV).
The CenCom Gold operates on a logic system. It isn't just about connecting power; it's about telling the computer what you want it to do. Here is how the main sections of the wiring diagram typically break down: