Hi the rectifer will get warm as the machine runs, the fact that the old one burned out could simply be as a result of age
You will also find the wires to the rectifier will also get warm close to the unit, assuming it does not blow a fuse, and that the correct fuses are fitted, and the battery is in good condition, a discharged battery could cause the rectifier to burn out, as the battery acts as a form of resistor for the unit, on some of the older machines like yours the charging system did not work, unless you had 12 volts in the battery to supply the DC side of the alternator
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