Alternator charging problem

[stanz]

Recently upgraded my 68 Roadrunner for electronic system and replaced wiring harness, but I am having problems with the charging fluxuating with RPM's I mounted a new VR QS 8313 and replaced alternator with a Duralast DL75334 to increase amps, but cannot get it to stay steady. I was wondering how to make sure wiring is connected correctly, blue wire to positive side brush fld clip and green wire to the ground side fld clip? HUMMMMMM

 

[Don Frelier]

Both field terminals need to be isolated from ground with the solid state regulator you're using.

 

[dadsbee]

If they weren't he'd probably have smoked his harness already, but worth sticking a meter on to make sure...

 

[stanz]

Which wire goes where?

 

[dadsbee]

Which wire goes where?

It actually doesn't matter if they are both isolated from the case.

 

[stanz]

It actually doesn't matter if they are both isolated from the case.

But why does my voltage still goes up and down with my RPM's up to 13.5 when I raise over 2000 and 10 volts at idle 800 or so RPM's