× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Alternator charging a battery
Posted to the Waveform Library on 1/13/2023

Alternator and battery wired in parallel. Alternator voltage 14, battery voltage 13.7 (includes surface charge), battery internal resistance .02 ohms, effective voltage across battery internal resistance .3 volts, battery charging current 15 amps.