17. BATTERY/CHARGING SYSTEM MXU 550EXI/MXU500I Ground line Check the continuity between the Green wire terminal and ground. There should be continuity at all times. Charging coil line Measure the resistance between each Yellow wire terminals. Standard: 0.10.3 (20C/68F) Check for continuity between each Yellow wire terminal and ground. There should be no continuity. 17-8