[Easy Installation] Simply the wiring diagram to connect your dual electric fan relay kit. RED to 12V DC battery positive terminal, COFFEE to positive fan, BLACK to ignition, GRAY to sending unit. INCLUDES WHAT YOU NEED: 2 x 40A Relay with Harness; 1 x 3/8" Thermostat Switch; 1 x 3/8" to 1/2" Adapter; 2 x In-Line Fuse Holder; 2 x 20A Fuses; 4 x Wire Connectors; 8 x Ring Terminals; [Compatibility] The dual electric radiator fan relay kit fits for 10 12 14 16 inch cooling fans. Fits 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 Engines 427 4 28 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 351M 400M 273 318 340 360 3 61 383 400 413 426W [Specifications] This electric fan relay wiring kit is 40A and 12V. The thermostat switch has a 3/8" NPT pipe thread with a 1/2" adapter included, turns on at 185 and off at 175 degrees. The relay is waterproof, so it can work in any adverse conditions. [IMPORTANT] The thermostat MUST be connected through the threads to the motor to work, and the motor MUST be connected to . If mounting high-profile fans, be sure to crimp or solder larger wires, as 14 AWG (15 amp) gauge wires are not large enough for high amp draw., Weight: 0.72421853067 Pounds, Manufacturer: Rtxbvg