"Pulsing" voltage, RPM drop with load.

JoePole1 said

my volt gauge which IIRC is connected to my cigg lighter.

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Lighter is connected to the hot side of the fuse box.

JoePole1 said

and Ign module plus

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That shouldn't matter, although it draws a little more than points.

JoePole1 said

I've disconnected it once and broke a tab off

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Black ABS cement may work as a temporary repair.
Do your tracing. Voltage drops due to poor connections will be most apparent when the current flowing through that circuit are higher.