oric_dan(333):
so what specifically needs to change in my original 'wiring diagram' so that it becomes a star ground wiring system?
Look in the link I've pointed you at twice now.
ok. I read it. It talked about using a main capacitor to absorb voltage spikes and drops. I tried using a 1000uF, 35v cap. It didn't have any effect. So, back to where we left off at. It flickers even when a charged cap is applied, it doesn't flicker when a the power door lock is being powered by batteries that share the same ground as the original power supply. Given these clues, what specific tests can be performed to find out what needs to be added to calm the voltage or current? What about an inductor? Maybe the capacitor isn't large enough?