[Compatibility]The dual electric radiator fan relay kit fits 10,12,14,16 inch cooling fans. Fit for engines 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 427 428 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 351M 400M 273 318 340 360 361 383 400 413 426W [Easy Installation] the wiring diagram to wire your dual electric fans relay kit. RED to 12VDC Positive Battery Terminal, COFFEE to Fan Positive, BLACK to Ignition, GREY to Sending Unit. [Specifications]This electric fan relay wiring kit is 40 AMP and 12V. The thermostat swtich is 3/8inch NPT pipe thread with 1/2inch adapter included, it turns on at 185 and off at 175 Degrees. The relay is waterproof so it can work in any harsh conditions. Includes everything you need: 2x 40A relay with harness;1x 3/8inch thermostat switch;1x 3/8inch to 1/2inch adapter;2x inline fuse holder;2x 20 Amp fuse;4x wire connectors;8x ring terminals; [Important]The thermostat MUST be grounded through the threads to the engine in order for it to work, and the engine MUST be grounded. If you mount high-profile fans, be sure to crimp or solder bigger wires to it since the 14AWG wires (15 amps) are not big enough for high amps draw. Colour:Photo Color Material:plastic Package Contents: 1 x Dual Electric Fan Relay Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.