Rectifier / Regulator
Twelve separate measurements must be made using a multimeter (preferably one with a Diode Test function).
Pin functions for OE regulator
Filter Capacitor (Early Models)
The filter capacitor is mounted behind the number plate. It is closely related to the rectifier/regulator because there is no battery in the system.
12V bus, good rectifier/regulator @ idle, fan off
Small SLA battery next to filter capacitor