4-Pin 1300-3849 Unsealed Connector – Starter, Brake Lamp & Motor Harness Socket

Direct-fit replacement for part number 1300-3849, a 4-pin unsealed plastic housing connector used for starter motor control circuits, brake lamp harness connections, and automotive motor wiring. The 1300-3849 is a medium-current connector designed for protected, dry locations within the vehicle electrical system.

Key Specifications

• Part Number: 1300-3849
• Pin Count: 4
• Gender: Female socket (with wire)
• Seal Type: Unsealed (for dry, protected environments)
• Wire Gauge: 18 AWG (0.5 mm²)
• Wire Length: 5.5 inches (140 mm)
• Housing Material: PA66 glass-filled nylon
• Terminal Material: Copper alloy, tin-plated
• Current Rating: Up to 13A per pin
• Voltage Rating: 12V / 24V DC

Applications

• Starter motor control circuit: Ignition switch to starter relay harness connector
• Brake lamp harness: Stop lamp switch and brake light circuit connector
• Automotive motor wiring: Window regulator, wiper motor, and blower motor harness connections
• Relay socket wiring: 4-pin relay control harness

Brake Lamp Connector Failure – Diagnosis

• Brake lights not working: Check fuse first, then measure voltage at connector Pin 1 with brake pedal depressed – should read 12V. No voltage indicates a switch or wiring fault upstream.
• One brake light inoperative: Typically a bulb failure, not a connector fault. If all brake lights are affected, inspect the stop lamp switch connector.
• Cruise control not cancelling on braking: The brake lamp switch signal is also used by the cruise control module – a corroded connector can prevent the cruise control from receiving the brake signal.

Frequently Asked Questions

Q: Can a bad brake lamp connector affect cruise control?
A: Yes. The brake lamp switch output is used by the ECM and cruise control module to detect braking. A corroded or open-circuit connector at the brake lamp switch causes the cruise control to not disengage when the brake pedal is pressed – a safety-critical fault.

Q: What crimping tool is needed?
A: Use a ratchet crimper rated for 18 AWG (0.5 mm²) – Engineer PA-09 or equivalent precision ratchet crimper.

Q: Is this connector suitable for 24V truck applications?
A: Yes. The housing is rated for 12V and 24V DC systems. Verify the terminal current rating matches the circuit load before use in 24V applications.

Package Contents

1 × 4-Pin Female Socket Connector (1300-3849) with 18 AWG wire and terminal insert