The XSP311 is an XS Power power-control accessory. XS Power lists it as: Harness for GM "SI" Series Alternators (1969 to 1988). The specifications below come directly from XS Power's June 2026 distributor data. Verify voltage, group size, polarity, dimensions, and application requirements before ordering.This Listing Includes: (1) XS Power XSP311 Harness for GM "SI" Series Alternators (1969 to 1988)Specifications Model XSP311 Product Type Isolators, Modules & Accessories Warranty 1 year UPC 692209015154 Package Length 3.5 in. Package Width 2.5 in. Package Height 10 in. Package Weight 1 lb. Available from JS Alternators.PROP 65 WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. Wash hands after handling.For more information, visit www.P65Warnings.ca.gov.
