- Exact Cross-Reference 12V Regulator Rectifier (31600-HN5-671): Direct aftermarket replacement for Honda stator-charge regulators. Replaces 31600-HN5-671, 31600-HN5-M40, 31600-HN0-671, 31600-HM7-003, SH683-12, 31600-KTB-003. 5-wire (3 AC stator + 1 B+ + 1 ground) layout, 77 mm hole-center, 10 mm mount holes-match old unit stamp and wire colors before ordering
- Dual Function AC to DC Rectify and 14V Regulate: Converts 3-phase stator AC to DC and clamps battery-side output to 13.5-14.8V under load. Prevents overcharge (boiled battery, fried ECU) and undercharge (dead battery, weak spark) on trail and street Honda 12V systems
- Die-Cast Aluminum Heatsink with Epoxy-Sealed Terminals: Finned aluminum body with silicone-sealed 5-blade plug and tinned leads resists heat soak under rear fender (ATV) or under-seat (motorcycle). Exceeds OEM load cycle; 25A continuous / 35A surge rated for 12V negative-ground
- Fits Honda TRX ATV 350/400/450 & Select Motorcycles: Engineered for TRX350 Rancher (TE/TM/FE/FM), TRX400FW Foreman, TRX450S/ES/FM/FourTrax/Foreman, TRX450R and motorcycles VT750 Shadow Aero/Spirit, VTX1300C, NC700X using the 31600-HN5-671 pattern. (Exact Year/Submodel - Rancher 2000-2006, Foreman 400 1995-2003, Foreman 450 1989-2004, VTX1300C 2003-2009, etc
- 15-Minute Harness Swap with No Programming Required: Disconnect battery, unplug 5-wire connector at old regulator (rear fender / subframe), remove 2 bolts (77 mm centers), seat new unit, reconnect by wire color (AC-AC-AC-B+-GND). Static-check: approximately 0.5-1.5 Ohm AC-to-AC, B+ open to ground. No ECU learn
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