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Old 10-20-2008, 08:28 PM   #21
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2005 22' Interstate
Afton , Virginia
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Most alternators have rectifier diodes that convert the ac generated by the alternator into DC that can be used in the battery charge circuit. The rectifier diodes operate off the rotor, as this is the unit that is driven by the crankshaft. Thus, the faster the crank spins, the higher the freq generated. This is what the tach must measure, if I get the drift of this thread.
One of the thread spinners (sorry) mentioned a manual. This is good advice.
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Old 10-22-2008, 05:13 PM   #22
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1982 28' Airstream 280
Buena Park , California
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Thanks for all the help. We got it figured out. Thank you. Thank you. Thank you.

One more question,
What rpm does your engine idle at?
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Old 10-22-2008, 05:32 PM   #23
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Glad you figured it out.

What did you find out? It may help others.

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Old 10-22-2008, 11:20 PM   #24
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1982 28' Airstream 280
Buena Park , California
Join Date: Oct 2008
Posts: 32
What we did was to trace all the regulator and alternator wires out and fixed any previous-owner wiring snafus. We found color coding changes hiding under electrician's tape and such. Example....yellow wire coming off of the alternator plug connected to a black wire and a black wire coming off of the alternator plug connected to a yellow wire all hiding with a layer of tape. Nightmare-ish.

We configured the six wires in the voltage regulator plug to match the engine manual wiring diagram. Our new, Echlin VR550 voltage regulator's plug is not configured the way the manual shows.

The pulse for the tach comes off of one of the stator phase windings. The stator is a wye, three phase stator. There is a wire connected to the output of one of the phase windings in the alternator harness. It was one of the color code switch-a-roo wires. This color code problem caused so much hair pulling, as you can imagine. We got good tach pulse signal, once we got the pulse wire sorted out.

The direct replacement Teleflex tach is a 54314D.

Three plus days chasing funky wiring issues.

Still have an apparent overcharge issue. Plan on getting that taken care of
tomorrow, Thursday.

Again, thanks to you all for your helpful input.
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