35A Single Fan Relay Kit – EFI Applications, Negative Trigger


This kit is for vehicles with Electronic Fuel Injection (EFI) with negative (-) fan triggering, which includes most of the aftermarket EFI offerings from all of the major manufacturers.  This completely waterproof kit installs easily and plugs directly into your electric fan via a standard fan plugs – of which most of the major fan manufacturers use.  Harnesses dressed in Split Braided Tubing for that show car look!

Triggering is fully automatic (see specifications below for specifics).  Powers fans requiring up to 35A continuously with minimal voltage drop!

Includes full color step-by-step instructions and all hardware shown.

Full specifications outlined below.



Wiring to Battery: 10 AWG TXL, terminated with a 5/16″ eyelet
Wiring to Fan: 10 AWG TXL pair, terminated with an OEM style fan plug
Maximum Current Capability: 35A
Typical Voltage Drop through wiring when driving a single 16″ fan requiring 25A continuous with 13.8 VDC of input:

  • Immediately after power up: 350mV or 2.5%
  • After 1 hour of continuous operation: 390mV or 2.8%
  • After 4 hours of continuous operation:  400mV or 2.9%

Triggering is as follows:

  • Fully automatic via low current fan output from EFI ECU
  • Compatible with ECUs outputting a Negative (-) trigger for the fan circuits

Dimensions of Relay Module with mounting bracket installed: 2 15/32″ x 1 5/8″ x 3 17/32″ (62mm x 42mm x 90mm)

Harness Lengths:

  • Power Harness to Battery:  3ft
  • Output Harness to Fan:  3ft
  • Trigger Input from ECU:  2ft
  • Switched Power Harness:  6ft


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