3 Batteries, 1 AlternatorNegative Ground6.5"L X 4.55"W X 2.52"H(165mmL X 116mmW X 64mmH)I/O Studs 5/16-18 ThreadBlue Aluminum Finned Heat Sink,Press Fit Diodes, Welded ConnectionsArco# BI-1203-3A Sierra# 18-6851