question on bulkhead connector bypass

Installed bypass and working fine - one difference I notice is at idle I get quite a lot of flickering in headlights and dash I did not really have much of before - my volt gauge shows voltage up and down at idle like the lights, steadier at higher rpm.. Is this common with the bypass set-up? I guess I don't care as long as it's gone at higher rpms but appreciate any comments/tips - thanks. btw, got electronic ignition if that could be an issue. I had already put in some headlight relays that basically let them run direct off battery and had gotten used to bright and virtually no flicker headlights at any RPM but that may be gone if I stick with this bypass setup.