STS Parts Alternator Conversion Harness – Delco SI to CS130 / CS144 with Resistor This high-quality 2-wire conversion lead is the reliable solution for upgrading your GM vehicle's alternator system from a Delco SI-series (10SI, 12SI, 15SI, 17SI, 27SI) to a modern CS-series alternator (CS121, CS130, or CS144). Designed with an inline resistor, this harness is ideal for vehicles using a voltmeter (not a charge warning light). Why Upgrade? Converting to a CS alternator provides improved efficiency, better charging at lower RPMs, and longer component life. This plug-and-play adapter makes the swap quick, safe, and seamless. 🔩 Technical Specifications: Length: 9.4 in (240mm) Wire Count: 2 Resistor Type: Inline (pre-installed) Weight: 0.09 lbs (0.04 kg) For Use With: Voltmeter-equipped vehicles only (not indicator light systems) 🔁 Cross Reference Part Numbers: Arrowhead: 110-12055 Delco: 12102921, 8078 J&N Electrical: 500-12036 Replaces PT2145 🚗 Fits Alternator Series: From: Delco 10SI, 12SI, 15SI, 17SI, 27SI To: CS121, CS130, CS144