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Tach problem

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scott stephens

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"'95 J88tsleoc-- tach inte

"'95 J88tsleoc-- tach intermittant; tested tach. w/ quiksilver tester, checks O.K. power to tach.- good. no ground faults. checked A.C. output @ terminal block. 24V.A.C.+@ idle. batterys charging O.K., running good. ran wire from terminal to tach.(bypassed harness plug) no change. replaced tach out of desperation, no change.when it works, it works well. a few minutes, and zero. any ideas?"
 
"On the terminal strip at the

"On the terminal strip at the engine, switch the Gray tach lead from the Gray terminal to one of the yellow leads from the stator assy (try both yellow leads if needed). If the tach operates fine when attached to either yellow lead, the rectifier is faulty and will require replacing.

If the rectifier is faulty as above, do not hesitate to replace it and replace the tach gray lead where it belongs as eventually that rectifier, especially if it is a water cooled voltage regulator/rectifier assy, will melt down and catch on fire, causing damage to other components."
 
"tried that. no change. also t

"tried that. no change. also tried taking rectifier out of curcuit. nothing. also connected tach-dwell meter to back of tach. needle came up, then slowly returned to zero. stator yellow leads measure 1.2 ohms across, infinite to ground; and getting good voltage. even though stator checks out, I wonder if it could be source?"
 
"Just to clarify..... The &#34

"Just to clarify..... The "gray" lead/wire that I stated to switch over to the Yellow stator lead would be the engine wiring harness "gray" wire, not the gray wire attached to the water cooled regulator/rectifier assy.

And when I say "switch", I mean to actually remove the gray wire and transfer it over to connect with the yellow wire, not to simply rig a jumper wire type connection.

If you did this test properly, and had two tachometers act up identically, that poses a mystery due to the fact that the stator is charging the battery properly."
 
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