✅ One Wire Simplicity, Maximum Convenience – Ditch the clutter! This self-exciting voltage regulator activates your alternator with a single wire hookup—no extra wiring or external excitation needed. Just install and drive. ⚡ Consistent 12V Power You Can Trust – Features 14.8V set point, 5-amp field, and A-Circuit design to ensure a steady, dependable charge—perfect for high-performance and restoration vehicles. 🔧 Wide GM Compatibility – Built to fit Delco 10SI, 12SI, 15SI, 17SI, and 27SI alternators (100 & 205 series IR/EF). Ideal for vintage builds, hot rods, custom rides, or daily drivers needing a reliable upgrade. 🛠️ OEM-Quality Performance – 100% brand new aftermarket unit, not remanufactured. Meets or exceeds factory specs. Replaces OEM numbers like Arrowhead 230-12029, Regitar D689, WAI 35-101-1, and others. STS Parts D10SE12 One-Wire Self-Exciting Voltage Regulator is engineered for superior performance and effortless installation. Compatible with Delco 10SI, 12SI, 15SI, 17SI, and 27SI alternators (Type 100/205 series), this self-exciting regulator eliminates the need for an external wire, enabling a cleaner, simplified one-wire setup. Operating at 12V with a 14.8V set point, 5-amp field, and A-Circuit configuration, this regulator provides consistent charging for your vehicle’s electrical system. It's an excellent upgrade or replacement part for restorations, performance builds, or everyday reliability. OEM Cross Reference: Replaces Arrowhead: 230-12029 Replaces CARGO: 233931 Replaces IPM: 1A-6013 Replaces J&N: 230-12029 Replaces REGITAR-USA: D689 Replaces RENARD: 5097 Replaces USI: 71-10027 Replaces WAI: 35-101-1 Trust STS Parts for quality and dependability—every regulator is 100% new