Yeah, Crane bought these guys a while back. I had an Allison myself when I
got my 80.
I called the Crane support line to try to get some help in making sure that
the unit was working correctly. He told me to "Put that piece of crap in a
box, ship it to us and we will sell you a new one at half price". I did
exactly that. At the very least it ruled out that black box as being a
problem.
This was a couple of years ago, I don't know if they still have that deal in
place. Worth a call, cause as I understand it, once that unit goes bad it
is just bad.
FWIW, the new unit has a LED on it to give you a clue as to when spark
should be happening.
Harold
----- Original Message -----
> The PO of my car installed an Allison XR-700 electronic ignition module in
> my MGB. There is, among others, a red and black wire coming out of the
> control box: the red goes to the (+) side of the coil, the black goes to
the
> (-) side.
>
> When turning the engine by hand, there is no change in voltage or
continuity
> from the black wire. The ignition was on, and as the slits passed the
> electric eye, I would have expected to see the a change in the black wire,
> similar to points opening or closing.
>
> Do I not understand the principle of the ignition circuit, or is something
> else amiss?
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