Thanks, Steve. My answer was incomplete in that I did not clarify
that you do have to change the coil as well, which is what I have
done. I had been running a Pertronix I in place of the points in my
distributor for several years along with the ballast resistor and the
original coil. This spring, when I first took the Tiger out, I pulled
into the garage and lifted the bonnet to check something and noticed
that the coil bracket was broken. I decided to replace the coil and
the bracket at that point since it was getting pretty old. I called
Pertronix to get their recommendation for a coil and asked if I needed
to continue to use the ballast resistor and they told me that it would
work either way with the new coil, so I removed it. As I said, one
less thing to break. I should have made it clear that you have to run
a 12v coil.
Tod
B382002384LRXFE
Steve Laifman wrote:
Tod and Tigers,
US coils, in the era, used 9 volt primaries on the coil. In the
"start" position the ignition switches powers the coil with 12
volts, and the "run" position directs the voltage through the
dropping resistor to 9 volts. British electrics were 12 VDC,
throughout.
(See Bill Gegg's COLOR wiring diagram(s) in the Online Rootes
Workshop Manual, Electrical Equipment:
http://www.tigersunited.com/resources/wsm/wsmN35.asp
Subsequent pages show the Mk IA, and Mk II diagrams.
Unless you changed the coil to one that runs continuously on 12
Volts, you will damage the coil.
The Pertronix (I or II) j switches the voltage through the points
to the coil, and is suitable for either 9 or 12 Primary VDC, it
does not switch the coil's high voltage output, of course. That is
the job of the rotor and cap.
If one wants to run a 12 volt coil, you must buy one rated for that
input voltage. Available as "high performance 12 VDC coil".
The Pertonix "Flame Thrower II is a good choice.
http://pertronix.com/prod/ig/flame/coils/45000_volt.aspx
Steve
___
Steve Laifman
Editor - TigersUnited.com
Tod Brown wrote:
Jim:
<--- snip --->
With respect to the ballast resistor, unless you are into
-- you can do away with it altogether if you are running a
Pertronix ignition. One less piece to go bad.
Tod
B382002384LRXFE
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