In my experience,engines with electronic ignitions( non points distributors ) you will need a good connection to keep the engine running. With EFI you will have some sort of controler weather a PCM,ECM etc.,those systems you need more than 12 volts,generally closer to 13.2 to run at optimal performance. As a Kid I remember running on just an altenator no battery,you won't get away with that on todays vehicles.
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