50 horse merc tach

[greasemonkeyjmj]

i replaced the stator, trigger, and the switchbox on my 77 500 merc, after doing this, the tach needle was moving real slow, and not showing the right reading. now it has stopped moving completely, any ideas on what is going on with this thing. i checked all wiring aat the connections and they all seem to be ok.
THANKS

 

[Barnacle_Bill]

Re: 50 horse merc tach

Test your rectifier.

 

[greasemonkeyjmj]

Re: 50 horse merc tach

what is the best way to test it ?

 

[Barnacle_Bill]

Re: 50 horse merc tach

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.

 

[greasemonkeyjmj]

Re: 50 horse merc tach

thanks BHILE rectifier was bad so i replaced it and tach is working correctly and it shows to be sending a charge to the battery.took it to the river today and it run like pure junk.