Jim,
I could be wrong on this, but I believe you need a negative ground
tach. I don't think you can switch them over from positive ground.
Gerard
At 2:56 PM -0700 7/13/03, Jim Rogers wrote:
>I've completed converting my Bugeye over to negative ground, but I
>am having a problem converting the tachometer from positive ground
>to negative. The only tach conversion instructions I have been able
>to find on the internet or books are for a different type (earlier
>positive ground tachs?) and the configuration & colored wires do not
>match. I need advise from Listers who have done a similar tach
>conversion in past.
>
>First ... tach is not original Bugeye. My tach is from a later Mark
>2 Sprite (HAN7), specifically a Smiths RVI2401/00 Positive Earth.
>The white wires wrap around the coil(?) and come out the back. One
>wire has a male connector, the othe a female. I've reversed my
>connections to the white wires per the instructions. Between the 2
>white wires is a spade connector which I assume is connected to my
>power wire. I've grounded the tach at one of the bracket screws.
>Inside the tach are 3 wires ... 1 yellow, 1 red and 1 black.
>According the instructions there are supposed to be 1 brown wire and
>1 green wire which I unsolder and switch (instructions are not in
>front of me so don't yell if I'm wrong about brown/green). So this
>is where I am most confused. Help!!
>
>PS. Tach is from parts car so I do not know for certain that it
>worked before. All the other gauges are fine, so I have assumed tach
>is also.
>
>PPS. I have a MGB negative ground tach which I have connected to
>the car & it works, so rest of my wiring should not be the problem.
>Tach is much smaller, it does not fit in dash otherwise I would just
>use it.
>
>Thanks in advance for any suggestions.
>
>Jim Rogers
>San Juan Capistrano, CA
60 Bugeye
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