Ammeter waving when ignition is on.

Have check the bulkhead connections to be sure they are clean and tight?
you have a loose or dirty connection somewhere.
Hmm, another issue that may be related is that the right turn signal indicator on the hood and in the dash is dimly lit constantly with the turn signals off. It operates normally when signaling a right turn. Possibly related?
I've also recently replaced the turn signal assembly in the steering wheel including the wiring to the connector under the dash. I don't think I botched the wiring but it's something else to check.