Solar Voltage
To test solar voltage (voltage coming directly from solar panel), disconnect one lead from the input terminals and place voltmeter probes on the X’s. Reading should be greater than 14 volts. If not, look for loose connections and damaged solar panel.
Reverse Voltage
To test reverse voltage (voltage passing through the regulator from the battery), disconnect one lead from the input terminals and place voltmeter probes on the X’s. Reading should be less than 0.20 volts (0.50 volts is marginal). If not, replace solar regulator.
Battery Voltage
To test battery voltage, disconnect one lead from the output terminals and place voltmeter probes on the X’s. Reading should be greater than 12.5 volts. If not, replace battery.
Charging Voltage
To test charging voltage (voltage coming through regulator), disconnect one lead from the output terminals and place voltmeter probes on the X’s. If the voltage is greater than 14 volts, replace solar regulator.
Make sure all leads are reconnected to appropriate terminals when finished.