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> Date: Friday, June 20, 1997 11:03:52
> From: carbuff
> To: david r simpson
> Subject: Re: Spitfire coil voltages
>
> David,
>
> Thanks for your response.
>
> I agree that what the new Crane ingition wants is the important thing. The
> Crane XR700 and PS20 coil instructions are insistant about the necessity of
> using a ballast resistor. In fact, a new resistor was provided with the coil.
> Of course, If I put the resistor in the circuit and it has a ballast resistor
> already, I've dropped the voltage twice -- not the way to get the hottest
> spark..
>
> I called the Crane Tech Hotline, and they told me something I didn't know:
> that (unlike a ballast resistor) a resistor WIRE will measure battery voltage
> until it heats up under load. They assured me that the XR700 is forgiving
> enough not to go POOF! right away (and the man said that, even if it did, it
> would be replaced under warranty at no charge to me.) (Refer to the thread
> about the Smoke Theory of Electrical Components) In any event, he said
> that running voltages would be in the 9V range.
>
> One confusing thing: why (and how) did you pick up a separate 12v source for
> the Crane? It only has 3 wires (ground, +, and -,) and is designed to be
> connected to the coil AFTER the ballast resistor voltage drop. (The more
> expensive XR3000 ignition IS designed to run without ballast resistance.)
>
> Atwell Haines
> '79 Spitfire FM96062 (WILL be dragged into the realm of the running.. OR
> ELSE.)
> '88 Lotus Esprit
> '88 Mustang 5.0
>
> CarBuff@scooter.net
>
> *****************************
> Dave Explained,
>
> . Really it is
> > more important what the Crane wants and then wire it
> > according. When I installed mine I get a different
> > source for both (coil & electronic module) that
> > always had 12 volts and used the new resistor which
> > came with the new coil. From what I gather, it is
> > a good idea to use the higher voltage coils(40,000
> > volts) to get the complete affect of the newer ignition.
> > FWIW
> > Dave Simpson
> > 61TR3B
> > 76 Spitfire
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