Positive Rectifiers

With alternator on an insulated surface, connect test lead clip to alternator "BAT" output terminal and plug tool into 110 volt A.C. power supply. Touch exposed bare metal connections of each positive case rectifier with test probe. Reading for satisfactory rectifiers will be 1 3/4 amperes or more and should be approximately the same for each rectifier. When two rectifiers are good and one is shorted, reading taken at good rectifiers will be low and reading at shorted rectifier will be zero. Disconnect lead to rectifier reading zero and retest. Reading of good rectifiers will now be within satisfactory range. When on rectifier is open it will read approximately 1 ampere, and two good rectifiers will read within satisfactory range.