This is a technical report regarding the . Please note that the Cobra 4600 is a legacy 40-channel AM Marine CB/Weather radio, commonly found in boats from the late 1980s to 1990s. If you are referring to a different model (e.g., a modern marine VHF or a different brand), the wiring will differ significantly. Technical Report: Cobra 4600 Wiring Diagram & Installation Guide Document ID: COB-4600-WIR-001 Date: Current Subject: Power, Speaker, Antenna, and Accessory Wiring for the Cobra 4600 Radio 1. Executive Summary The Cobra 4600 requires a stable 13.8V DC power source (negative ground), a compatible marine antenna with a PL-259 connector, and an external 4-ohm speaker for optimal audio. Incorrect wiring leads to blown fuses, low transmit power, or permanent damage to the final amplifier. 2. Power Wiring (Main Harness) The radio uses a 3-wire pigtail (Red, Black, and usually an Orange or Yellow wire for memory/sleep mode).
| Pin # | Wire Color (Typical Cobra Mic) | Function | | :--- | :--- | :--- | | 1 | Shield / Braid | Receive Audio Ground | | 2 | Red | Transmit (TX) – Switched to ground when PTT pressed | | 3 | White | Audio (Mic element) – Hot | | 4 | Black | Common Ground / Shield |
| Wire Color | Function | Connection Point | | :--- | :--- | :--- | | | Main Power (13.8V DC) | Connect to positive battery terminal or main DC distribution panel via a 2A fuse (or 5A inline fuse as specified on the radio case). | | Black | Ground (Negative) | Connect directly to the ship’s negative bus bar or battery negative terminal. Do not rely on mounting bracket ground. | | Orange/Yellow | Memory Backup | Connect to a constant +12V source (unswitched). If left unconnected, the radio will forget stored channels and weather frequencies when powered off. |
| Connector Part | Wire/Core | Connection | | :--- | :--- | :--- | | Center Pin | Copper Center Conductor (RG-58/U or RG-8X) | Solder to pin. Carries the RF transmit signal. | | Outer Shell | Braided Shield | Connect to PL-259 connector body. Provides ground plane reference. |