1. Checking the positive valve.
A) Connect the negative tester (probe) ohmmeter to the positive terminal of the rectifier unit, and the positive probe (probe) connect in series to each of the other three outputs.
Check for conductivity (closed circuit) in all three dimensions.
b) Reverse the polarity of the tester probes and repeat the procedure of paragraph (A). Make sure the circuit is open in all three dimensions (resistance tends to infinity).
If the conditions are not met, replace the rectifier unit.
2. Checking the negative valve.
A) Connect one probe (probe) ohmmeter to the negative terminal of the rectifier unit, and the second probe (probe) connect in series to each of the other three outputs. Check for conductivity (closed circuit) in all three dimensions.
b) Reverse the polarity of the tester probes and repeat the procedure of paragraph (A). Make sure the circuit is open in all three dimensions (resistance tends to infinity).
If the conditions are not met, replace the rectifier unit.