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Mercury 900 tach problem

Merc rectifier.jpg

One of the most common reasons for a tach to stop working is a bad rectifier. Here is how you rest it.
Testing Merc’s square rectifier
If you use an analog meter set it on the RX1000 scale.
If using a digital meter, set it on the diode symbol.
1. Disconnect the battery leads.
2. Disconnect all wires on the rectifier.
3. Connect the red test lead to ground and the black lead alternately to terminals A and C.
The meter should show continuity.
4. Connect the black lead to gound and the red lead alternately to terminals A and C.
The meter should not show continuity.
5. Connect the black lead to terminal B and the red lead alternately to terminals A and C.
The meter should show continuity.
6. Connect the red lead to terminal B and the black lead alternately to terminals A and C.
The meter should not show continuity.
7. Replace the rectifier if you do not get correct readings.
 
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