FASTSTORM Dual Electric Fan Relay Kit — 60A Waterproof 4‑Pin Harness with 200°F Temp Switch for 10–16" Fans

FASTSTORM Dual Electric Fan Relay Kit is a complete 60A wiring and temperature-switch package that turns dual radiator fans on at ~200°F and off at ~185°F for reliable engine cooling control.

This ready-to-install kit bundles a heavy-duty 60 amp relay, waterproof 4-pin relay harness, OE-style temperature sensor switch, adapters and all necessary connectors so you can set up one or two electric fans quickly. Designed to work with 10", 12", 14" and 16" fans, the harness follows a clear wiring diagram and is built for automotive, truck and marine cooling applications where precise fan activation is required.

How does the kit control fan temperature and reliability?

The included temperature switch monitors coolant or water-jacket temperature and closes the circuit at about 200°F, opening again at about 185°F. Its OE-style thread mounting ensures firm metal-to-metal grounding for accurate readings and consistent operation when installed properly in the cylinder head or water jacket.

• Temperature switch set points: ~200°F ON / 185°F OFF
• 3/8" thread on sensor with 1/2" adapter included
• OE-style mounting requires thread-to-engine grounding for reliability

What wiring and components come with the relay kit?

The kit supplies a 60A relay and a waterproof 4-pin relay harness, two inline fuse holders, four 20-amp fuses, multiple ring terminals and wire connectors so you won’t need extra parts. A straightforward wiring diagram shows which wires go to battery positive, fan positives, ignition, and the temperature sender to speed up installation.

• 60 amp relay and waterproof 4-pin connector
• Complete wiring harness with red (battery +), blue (fan +), grey (sender) and yellow (ignition) leads
• Includes fuse holders, fuses, adapter, spade and ring terminals

Can this kit run single and dual fan setups, and what fan sizes fit?

Yes — the relay wiring supports both single and dual electric fans without modification, and the harness terminals are sized for high current draw. It’s compatible with popular fan diameters so you can use it for compact or large radiator fan configurations.

• Supports one or two fans with shared relay control
• Fits 10", 12", 14" and 16" cooling fans as a direct replacement
• 60A capacity handles typical dual-fan loads; ensure combined amperage stays within limits

How does installation work and what vehicle types is it suited for?

Installation follows the included diagram: attach red to battery positive, blue to fan positive, grey to the temp sender, and yellow to ignition. The kit is built for use in cars, trucks, and marine applications where electric fan control is needed; proper grounding of the sensor and engine is critical for correct operation.

• Mount the temperature sensor in the head or water jacket; threads must ground to the engine
• Wiring diagram reduces guesswork for hobbyists and mechanics
• Suitable for automotive, truck, and boat installations

Who this kit is for: FASTSTORM’s Dual Electric Fan Relay Kit is intended for DIY mechanics, performance enthusiasts and professional installers who need dependable, temperature-actuated fan control. It’s a practical upgrade or replacement for OEM-style systems on cars, trucks and marine engines where precise fan activation, simplified wiring and a complete parts set matter. If you plan to manage one or two fans with a single relay package and want clear wiring guidance plus all required connectors, this kit is designed to save time and reduce parts-buying guesswork.