Rywire Mil-Spec Fuse/Relay Box Sub-Harness
Rywire Mil-Spec Fuse/Relay Box Sub-Harness

Rywire Mil-Spec Fuse/Relay Box Sub-Harness

  • Easy Plug-and-Play Installation

  • Flying Leads for Fan and Fuel Pump

  • Five Relays and Fuses for Key Functions

  • Compatible with Most Engine Swaps

$425.00
 - $450.00
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PRODUCT DETAILS

The Rywire Mil-Spec Fuse/Relay Box Sub-Harness is an essential upgrade for racing enthusiasts and engine swappers. Available in two options—Honda K Series Engine specific and a universal version compatible with a wide range of swaps including Honda B, D, and H Series—this harness simplifies and optimizes your setup for maximum efficiency and performance.

K Series Specific: 
The K Series harness is perfect for race cars running solely the engine. This harness features five relays and fuses, facilitating the operation of Rywire harnesses or OEM 02-04 RSX/EP3 harnesses in any car. It includes flying lead connectors for the fan and fuel pump wires and a flying lead harness for optional gauge cluster functions. Key components include a COMPUTER, FAN, FUEL, STARTER, and O2 SENSOR RELAYS, a COMPUTER "E" plug prewired, a C101 plug-and-play engine harness connector, a primary 4-wire O2 sensor plug, an easy hookups to cluster wiring, and ignition switch. It is designed to work with factory-style K series harnesses like "K2-base" or "K2-Milspec" but is not compatible with the Infinity K harness.

Universal Version: 
The universal race fuse/relay box offers a versatile solution for various engine swaps. It includes 5 relays and fuses, a 4-pin DTP connector for the fuel pump, fan, spare output, and switched output. This harness was designed for Rywire B/D/H series harnesses but can be adjusted to integrate with other engine harnesses upon request. Installation is straightforward—just run wires to the fan, fuel pump, power, and ignition switch, and you're ready to go. This product works seamlessly with a switch panel system and includes an auxiliary relay for electric water pumps, lighting, and other accessories.

Both versions of the Rywire Mil-Spec Fuse/Relay Box Sub-Harness are built using top-quality materials for reliability and performance, making them an ideal choice for any race or high-performance vehicle setup.

You may need a Mating Deutsch Connector if you use this fuse box with a switch panel different from the Rywire Switch Panel
Universal
K Series Specific Harness:
Relays Included: 5 (Computer, Fan, Fuel, Starter, O2 Sensor)
Fuse Box Dimensions: Compact and race-oriented for engine-only applications
Connectors: 
  • COMPUTER "E" plug prewired
  • C101 plug for engine harness connection
  • Primary 4-wire O2 sensor plug
  • Flying leads for Fan and Fuel
Compatibility:
  • Compatible with Rywire K-series harnesses (K2-base or K2-Milspec)
  • Not compatible with Infinity K harness
Wiring:
  • Flying lead connectors for fan and fuel pump wires
  • Flying lead harness for optional gauge cluster functions

Universal Harness:
Relays Included: 5 (Common functions similar to K series, including auxiliary relay for additional uses)
Fuse Box Dimensions: Compact design suitable for a wide range of engine swaps
Connectors:
  • 4-pin DTP connector for fuel pump, fan, spare output, and switched output
  • Optional mating Deutsch connector if using a different switch panel
Compatibility:
  • Designed for Rywire B/D/H series harnesses
  • Customizable for other engine harnesses with engine harness pin-out and connector mate available on request
  • Compatible with AEM Infinity harness lineup, S2000, 2JZ, and other Rywire harnesses with adjustments
Wiring:
Flying leads for easy connection to fan and fuel pump power
Works seamlessly with a Switch Panel system
Auxiliary Relay: 
Can be used for electric water pump, lighting, and other accessories  

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