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Do you know how to re-configure for a positive reading? That makes more sense to me.

I've just flown again with no issues after thoroughly buffing the contacts on the shunt and re-applying the DeoxIT liquid. Your question of what the ammeter is actually measuring puzzles me and so far I don't have access to a Flight Design CTLS schematic. I suspect that it is showing bus...

The anomely does not occur at low RPM. It only happens inflight and just for a few seconds. The ammeter drops to the bottom of the scale and hits the red line (approx. -22 amps), then sets off the engine alarm which can be silenced with the silence button that pops up. Within 2 or 3 seconds...

There is an external VR that I replaced that seems to have fixed the generator light that was flickering on at low RPM's. But the intermittent amperage spike seems to be unrelated. I believe the redline on the ammeter is minus 22 because it flashes for 2 or 3 seconds, enough time to see it...

My CTLS is sounding the engine alarm when the ammeter hits the redline briefly. I've tried cleaning the connections on the shunt with no luck.