I had this exact problem for many years and discovered that the wire from
the coil to the tach to the ignition (white) has a huge amount of
oscillating current, and as a result all the connections on the wire had
built up surface corrosion. I cleaned it all up and firmly soldered all
the varios connectors, never had a problem after that.
On Tuesday, August 20, 2013, Len and/or Marge Hartnett wrote:
> Not sure this was received by all on The List as it went out as Rich Text
> (HTML) although I did receive one response to check the coil and condenser
> (I have Pertronix). I'm trying Plain Text this time
>
> My BJ8 tach has become erratic (not erotic although the needle is doing a
> great shimmy and shake). In 2004, it was steady but incorrect. I replaced
> the C2 capacitor per article by Frank Filangeri (can be found on John Sim's
> web site) and that solved the inaccuracy problem. Now it fluctuates
> constantly by 100 or 200 rpm. There are two other articles on John's site
> one of which (author unknown) recommends replacing virtually every
> electronic bit and piece in the tach.
>
> I can not find anything in the archives specific to my current problem so
> therefore my question is: will replacing only the C2 capacitor solve my
> erratic needle problem? Is there something else I should check first? I
> do not relish the idea of replacing eleven items one by one and having to
> reassemble and test each time.
>
> (The Other) Len
> Vacaville, CA, USA
> 1967 AH 3000 MkIII, HBJ8L39031
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