For Delco Anti-Feedback Alternator Harness/Lead RN 46-1873 W330 S3300 SA7112D 50-4140D Reference PN For The anti-feedback lead is a great alternative to the self-excited or 1 wire alternator. There is a diode in the excitation wire to prevent the back-feeding of current,&the problems this can cause. Just plug the anti-feed-back lead into your alternator&plug in the original harness, or splice it into your harness. Wiring is simple, the green wire can be connected to the battery stud on the rear of the alternator. The black wire can be connected to the positive side of the ignition coil or any convenient 12-volt power source that is hot only when the engine is running. Fits 10SI, 12SI, 15SI, 17SI,&27SI For Delco Alternators No need to rev the engine to get the alternator to "kick in". No engine "run on". Simple wiring Tech Notes Length: 1.575in / 40mm Inline Fuse, Diode or Resistor: Yes Number of Wires: 2 Notes: Includes Inline Diode That Prevents Ignition Feedback from Alternator Application: For Delco Alternators Weight: 0.03 lbs / 0.01 kg