All lights flicker when running

I went through this and even though it could be a million different things. Check to see if the ohm gauge pulses with it. Mine did. I cleaned the contact for the regulater since that grounds itself to the body. At the same time I replaced the battery ground strap, the strap coming from the front of engine to the radiator area and added one missing from the back of the head to the firewall. Problem solved. I got all that info from here, thank you very much.