If you do have the Opus ('Opeless) system then you should already have a
solid-state trigger (magnetic) in place of points, which is all the
Pertronix is. The Opus system needs the 6v (1.5ohm) coil and two ballasted
supplies. One was the loom ballast used on all rubber bumper MGBs and had a
white (or white/brown) at the fuse-box end and a white/light-green at the
coil end. The other was a resistor for the electronics that had a
white/blue to the distributor. The distributor also had a full12v
unballasted supply.
If the Opus electronics have been disabled in some way, and you have points
firing the coil directly, then you can replace the points with the
Pertronix.
With either points or Pertronix, to use a 12v (3 ohm) coil you must have a
full 12v (white) to the coil +ve and not the ballasted 12v
(white/light-green). Again with both systems to use a 6v coil you must have
a ballasted 12v on the coil +ve.
You really should determine exactly what you currently have, in the shape of
12v or 6v coil, ballast or no ballast, points or Opus trigger, and Opus
electronics or not before you change anything.
----- Original Message -----
From: "Paul Root" <proot@iaces.com>
To: <mgs@autox.team.net>
Sent: Thursday, January 10, 2002 2:54 PM
Subject: Pertronix ignition and coil
> Hi all,
> Thanks to a generous gift certificate to the Little
> British Car Company from Jim Schulte, I bought a pertronix.
>
> I'm certain I have the correct EI, the LU-141 for my
> '77B. It has a dizzy with the big block on the side, the
> amplifier. The Moss catalog calls it the 'Opus'.
>
> Anyway, I think I bought the wrong coil, but I also
> think, it probably doesn't matter. I got the 3 OHM 40,000v
> Flame Thrower. A quick glance at the install instructions said
> that this is for non-ballasted systems, and if you want
> ballasted,
> then get the 1.5 OHM or remove the ballast.
>
> So, should I return it or remove the ballast? And the
> ballast is the resistor block on the side right?
///
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