Core Specifications:
Part Number: 13502753 (Original GM part number)
Voltage: 12V DC (Standard automotive electrical system voltage)
Current Rating: 20 Amps (Handles loads up to 20A, suitable for many automotive accessories)
Terminals: 4-Pin (Standard ISO Mini Relay configuration)
Type: Standard ISO Mini Automotive Relay (Very common, compact form factor)
Compatibility & Applications:
Primary Vehicles: Chevrolet Silverado, GMC Sierra (Specific model years/generations - check your manual or fuse box diagram for exact fit)
Other Vehicles: Select General Motors (GM) Vehicles (Commonly found in many GM trucks, SUVs, and cars from the 1990s through 2010s+).
Common Fixes/Replacements:
Headlights (Low Beam/Near Light): Often controls the power to the low beam headlights.
Fuel Pump: A very common application. Failure causes a no-start/no-fuel condition.
Horn: Controls power to the horn. Failure results in a non-working horn.
Parking Lights: Controls power to the parking lights/running lights.
Other Uses: Can also be found controlling radiator fans, A/C compressors, blower motors, fog lights, and various other accessories in compatible vehicles.
Key Features & Benefits:
Direct Replacement: Designed as a direct plug-in replacement for the failed original relay in the specified fuse box locations.
Multi-Purpose: Its standard 20A 4-pin design makes it functionally identical to many relays used for different systems within the same vehicle. Crucially:
It can be used to replace any failed standard 4-pin 20A relay of the same type within your compatible GM vehicle.
If you have multiple identical relays (e.g., one for fuel pump, one for horn, one for headlights), this single part number can serve as a spare for any of them.
Fixes Common Problems: Replacing a faulty relay with this one is often the fastest and most cost-effective solution for sudden loss of function (e.g., horn not working, headlights not coming on, fuel pump not priming/running, parking lights out).
Reliability: Replaces worn-out or intermittently failing relays, restoring reliable operation.
Important Notes:
Confirm Location: Before replacing, consult your vehicle's owner's manual or fuse box lid diagram to identify the exact relay location for the system you are troubleshooting (e.g., "Fuel Pump Relay", "Headlamp Low Relay"). Don't just pull relays randomly.
Diagnosis: While relay failure is common, ensure the issue isn't a blown fuse, a faulty switch (e.g., headlight switch, horn button), a wiring problem, or a failed component (e.g., fuel pump itself, horn itself) before replacing the relay. Swapping a relay with a known good one (like from the horn or A/C slot) is a quick diagnostic step.
Socket Type: Verify your vehicle uses the standard 4-pin ISO mini relay socket. This relay will NOT fit 5-pin (changeover) sockets.
In Summary:
The GM Relay Part # 13502753 is a standard 12V DC, 20A, 4-pin mini relay. It's a direct, multi-purpose replacement commonly used for critical systems like the fuel pump, horn, low beam headlights, and parking lights in Chevrolet Silverados, GMC Sierras, and many other GM vehicles. Its key advantage is that it can replace any failed standard 4-pin 20A relay within the compatible vehicle's fuse boxes. Always confirm the correct relay location using your vehicle's documentation before installation.