Rectifier...what does it do???

[dfrants]

the tach on my 1973 Johnson 65hp stopped working. tried a new tach, still didn't work. Service guy said I need a new rectifier. Motor seems to run pretty good with the "bad" one still on.

 

[ondarvr]

It converts AC to DC for charging the battery and running other 12V stuff. It doesn't have anything to do with the motor running.

 

[F_R]

No Title

But it does affect the tachometer.

Rectifiers can be tested. There are four diodes in there. All four are tested in both the forward and reverse direction (pass current in one direction only) All four have to pass. That's 8 tests. 4 forward and 4 reverse.

 

[joeanna]

Bridge Rectifier is another name to search to learn what it does.