I have wired a few cars grounding everything to the frame. Yes, everything on the car worked. My newest car I wired it with floating grounds/busbar in the car. Then used ground cables to both heads. I used an alternator and ran a seperate battery cable to the alternator from the battery. Basically went wild with battery cable. Now thta its done I'm a believer. I think this car seems to crank better, charge better, start easier than any i have had in the past. Maybe its my imagination, but I really think it works I'm drinking the kool-aid on no chassis grounds. I know it adds work to ground this way instead of chassis but i think its worth it. I have done wiring work on offshore performance boats and you have to wire this way (no chassis).