MR538851 Relay Replacement 13848981 D1777C 13502753
Key Features
- Includes 2 relays per pack
- 12VDC 20A high-current relay design
- 4-pin SPST (Single Pole Single Throw) configuration
- Helps restore stable electrical operation
- Designed for fuel pumps, lighting, and accessory circuits
- Durable heat-resistant construction
Reliable Power Keep an eye on for Automotive Systems
The MR538851 SPST Relay is designed to revive reliability in high-demand automotive circuits. As an immediate OEM replacement, this 2-pack ensures uninterrupted performance for fuel pumps and lighting systems, leveraging a 4-pin SPST design to control 20A lots safely.
Learn how to test your SPST relay by using this handy DIY article here.
Key Features:
20A 12VDC Capacity: Ideal for fuel pumps, headlights, and auxiliary circuits requiring stable high-current switching.
Replaces OEM Part Numbers
Compatible replacement for:
- 13848981
- D1777C
- 13502753
- 19116962
- 3600330C1
- 303-1AH-C-R1 U01
Durable Construction: Copper alloy contacts withstand arcing, with an operating range of -40°C to 85°C for harsh environments.
Plug-and-Play Installation: Matches factory 4-pin sockets (SPST layout) for 5-minute replacements.
Vehicle Compatibility
Compatible with many:
- Ford vehicles
- General Motors vehicles
- Dodge vehicles
(Always verify relay layout, amperage, and OEM part number before ordering.)
Compatibility Note: Confirm fitment by means of VIN or repair manual.
High Current SPST Design – 20A 12VDC 4-pin relay ensures stable Keep an eye on of fuel pump, headlights and auxiliary circuits
Common Applications
Used for:
- Fuel pump circuits
- Headlight systems
- Cooling fan relays
- Auxiliary lighting
- HVAC electrical circuits
- General automotive switching applications
Tiny component. Very important job.
Direct Replacement for More than one OEM Relays – Compatible with Ford, GM and Dodge vehicles (validate year/model); Replaces 13848981, D1777C, 13502753, 19116962, 3600330C1 and 303-1AH-C-R1 U01
Solve Vital Electrical Problems – Solve fuel pump failures, flickering lights and relay overheating
Cross Reference Compatibility – Compatible with Bosch 0332019150 and Delphi D1777C for seamless integration
2-Pack Value Backup – Dual relays make certain redundancy for Vital systems like fuel delivery and lighting
Symptoms of a Bad Relay
A failing relay can cause:
- Fuel pump no-start issues
- Flickering or dead headlights
- Intermittent electrical problems
- Overheating relay housing
- Random accessory failures
And yes, sometimes smacking the fuse box actually makes it work temporarily. That’s usually the clue.
Performance Benefits
Replacing worn relays restores:
- Stable electrical operation
- Reliable fuel pump activation
- Proper lighting function
- Reduced overheating risks
- Improved circuit reliability
Basically, your vehicle stops acting electrically possessed.
MR538851 12V 20A 4 Pin Automotive Relay Fuel Pump Lighting Replacement
Installation Notes
- Plug-and-play relay replacement
- Verify pin configuration before installation
- Recommended to inspect fuse box terminals for corrosion or heat damage
Simple repair. Huge reliability improvement.
Final Take
No horsepower gains.
But without reliable relays, your vehicle doesn’t even reliably start—so this little part earns its paycheck.
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