Good to hear you got the center to full scale waving reduced. from what I surmized, the minor bounce sounds like it would the regulator switching from full field to half field now. Charging voltage should be right at normal.
the check out procedure while at idle (where you now see the bounce) of forcing full field current should stop the bounce, But if idle is where the regulator is trying to reduce voltage, going with the full field jumper will raise the voltage and begin to over charge the battery, so monitor and keep the duration to a minimum (30 minutes if voltage is say less than 14 VDC, less if greater)
the minor bounce at regulator switching is a good canidate for a smoothing capacitor
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.