Stator good bad?

[Texasmark]

Stator puts 14.5 on a good 95% charged battery at 1500 rpms (for a number). Any reason to suspect that the signal picked up for the tach could be faulty on original Rect-Regl. and new replacement? What would be the mechanisms?

Coil shorted, ok it drops a couple of poles would still get a reading on the tach, just not the correct value.
Coil open, no output to the Rect-Regl, no battery charging.

What else could go wrong with the tach signal caused by the stator?

I think I'll see what a DMM with a digital oscilloscope costs so I can see a picture of the AC used for the tach signal.

Edit: That was quick. Done deal. https://www.ebay.com/itm/Oscillosco...206416&hash=item3d02f006a1:g:SWQAAOSwoIpbmgJ8
Thanks

 

[gpavkovick7868]

Don't see correlation of stater and tachometer. Tachometers usually get their signal from distributor side of coil if this application uses old school coil and module or points. Stater is usually a three winding assembly that has (continuity) between all 3 nodes, but is insulated from the laminated core (infinity).

 

[Texasmark]

This tach is outboard motor specific. Reason is method of obtaining battery charging power off induction coils under flywheel. Thanks

 

[Chris1956]

You can disconnect the rectifier/regulator from the stator and insulate the wires, after connecting one to the tach.. That should give you a good signal to the tach. If the tach no workee, it is likely bad.

A conventional voltmeter should be able to "see" an AC voltage on the stator wires. Not sure what the reading would be, but it should be some kind of AC waveform.


After reconnecting the rectifier/regulator, check for AC voltage at the motor when engine is charging. Sometimes diodes short allowing AC to reach battery.

 

[Texasmark]

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You can disconnect the rectifier/regulator from the stator and insulate the wires, after connecting one to the tach.. That should give you a good signal to the tach. If the tach no workee, it is likely bad.

A conventional voltmeter should be able to "see" an AC voltage on the stator wires. Not sure what the reading would be, but it should be some kind of AC waveform.


After reconnecting the rectifier/regulator, check for AC voltage at the motor when engine is charging. Sometimes diodes short allowing AC to reach battery.

Thanks Chris. I was just curious how pure the sine waves were...really should be pretty clean since it's electromagnetic induction, not chopper generated. On the Oscilloscope, I used to have a surplus from work and it died of old age. I get curious every once in awhile so the one I ordered will get usage.

I found the problem. Will pass on to Faztbullet as soon as I finish this reply to you. The connector on the rear of the instrument replaced the individual terminals on my old one and initially I couldn't find the right pigtail to fit the connection...finally Farina customer service got me the right Packard Cable Co. part number but the cable that fit had a screwy color code for the 4 wires and I had it wired backwards. Swapped the pins to the correct location and works fine. Had it out today and checked with my digital and close enough to believe.