Replaced factory cluster w aftermarket. Turn signal issues

I'm with Redfish. Either you made a major mistake in wiring which never should have been disturbed in your conversion, or you have grounding problems with the front lamps

I forget "if all years" but some years the indicators are simply a branch of the front lamps feed right off the TS switch connector. They may be Y'd off at the bulkhead connector some years. So it is "just a wire." If the indicators don't work, they are not grounding, but that should NOT affect the flasher or outer lamps

Often a flasher will change speed dramatically between low or charged battery and or when running and charging