Old stator effect on tach?

[pman7]

After reading this forum a while it seems the high voltage caused by either a bad voltage regulator or from the normal degrading of an old stator is quite common.

To reduce the voltage to your system it's usually recommended one get a new voltage regulator.

This got me to wondering about the signal wire to the tach. If I'm thinking clearly, the signal wire to the tach is upstream from the regulator. So the tach's signal is coming straight from the old degrading stator with the ever increasing voltage and without the protection of the regulator.

Does the high voltage directly out of the stator ever get high enough to start negatively affecting the tach through the tach's signal wire?

 

[tashasdaddy]

Re: Old stator effect on tach?

the rectifer converts the AC voltage produced by the stator to DC current to charge the battery, and the rectifer is the sender to the tach. not directly from the stator.

 

[pman7]

Re: Old stator effect on tach?

the rectifer converts the AC voltage produced by the stator to DC current to charge the battery, and the rectifer is the sender to the tach. not directly from the stator.

So now I'm more confused on the stator/rectifier relationship. On my old 71 Merc there are two yellow wires that run from the stator to the rectifier. And there is one red wire running from the rectifier to a lead on the internal harness plug. This harness plug red wire lead is then routed to the positive battery and the starter solenoid.

So I'm wrong to assume that both yellow stator wires leading to the rectifier are AC and the red wire going to the harness plug is DC?

The tach sender wire hooks right on to either of the yellow wires going from the stator to the rectifier. Isn't this the AC side, (upstream) of the rectifier?

 

[ricksrster]

Re: Old stator effect on tach?

You are right. The tach hooks on to the unreconciled side of the recifier.
http://ww2.tflx.com/pdf/obtach~1.pdf
http://ww2.tflx.com/PDF/99320.pdf

 

[ricksrster]

Re: Old stator effect on tach?

The tach works on pulse from the stator. 12 pole is 6 pulse for example.