70A Dual Fan Relay Kit – Carbureted with Deluxe Trigger


This kit is for vehicles with carburetors with or without air conditioning.  This completely waterproof kit installs easily and plugs directly into your electric fans via standard fan plugs – of which most of the major fan manufacturers use.  Harnesses dressed in Split Braided Tubing for that show car look!

Triggering offers three modes via dash mounted switch:  ON/OFF/AUTO (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: Dual 10 AWG TXL, terminated with a 5/16″ eyelet
Wiring to Fans: Dual 10 AWG TXL pairs, terminated with OEM style fan plugs
Maximum Current Capability: 35A per fan for a total of 70A
Typical Voltage Drop through wiring when driving a pair of 16″ fans requiring 25A continuous each with 13.8 VDC of input:

  • Immediately after power up: 380mV or 2.8%
  • After 30 minutes of continuous operation: 430mV or 3.1%
  • After 1 hour of continuous operation:  440mV or 3.2%

Triggering is as follows:

  • Dash mounted switch provides three modes:
    • ON – fans ON any time the ignition switch is in the RUN position
    • AUTO – fully automatic via thermostatic switch
    • OFF – fans OFF
  • Fully automatic via air conditioning (fans come on when A/C compressor is running)

Thermostatic Switch Specifics:

  • 185 degF ON / 175degF OFF
  • Threads are 3/8″ NPT
  • Includes 1/2″ NPT adapter

Dimensions of Relay Module with mounting bracket installed:  3″ x 3 1/8″ x 2″ (76.2mm x 79.38mm x 50.8mm)

Harness Lengths:

  • Power Harness to Battery:  3ft
  • Output Harness to Fans:  3ft
  • Thermostatic Switch Harness:  4ft
  • A/C Harness:  5ft
  • Switched Power Harness:  6ft


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