Ok to build on this problem. We went out yesterday and I watched the tach more. It seems to be an issue the first 10 mins it runs?? Like after startup it was reading 2 or 3000 rpms sitting there in neutral as I started it. Then it settled back down to normal...say around 1000 nothing to really worry about. Then as I was ideling out of no wake it was like reading 4000, then settled back to like 2000 which I beleive to be in the Relm of what I was actually turning. Then I give it gas and it bounced around and back to 4000 to 5000, I don't remember what it was bit I was not wide open. Then pushed the throttle and I was maybe 85 to 90% of my throttle range. Tach was over 5000 maybe 5200?? Then it started increasing without the engine rpm changing. It went to 7000. Engine was no where near that speed. I beleive the 5200ish that it was reading then settled back down too. We rode some more and it read true and parked , swam, and it was I think correct acting on the way back, maybe saw it creep around some a few mins after I restared but I honestly do t remember so it must not of been as erratic.
I have read Joe Reeves methods of testing a rectifier. BUT one method would I guess work if your tach was doing nothing ...the moving the wire method on the terminal block. I guess it could stop the erratic nature of it.
And the other method is to remove the wires from the block and test continuity between wires and should get it one way and not the other. If you get it both ways it's bad. This is obviously testing to see if diodes are blown in it I assume. The question is would it fail these tests but still give a correct tach signal 90% of the time? Or if it failed would it still give the correct tach reading 90% of the time?
What are you experts thoughts on this?
Motor runs flawless and is not hard starting, does not miss, surge or anything random.
