Been doing lots of research but cannot seem to find a consensus on how to safely incorporate a battery disconnect switch when using an EFI system. Not even sure what the specific concern is to be honest. The best explanation I've heard so far is that when the battery is suddenly disconnected from the alternator a voltage spike may occur, and if it does, it can make the EFI processor (ECU) most unhappy. I've contacted the maker of my EFI system who advised me to put only the battery on one side of the switch and all other electrical components on the other (switched) side. The problem with this approach is that I don't believe it will allow the disconnect switch to function as the intended safety device. In other words, if I disconnect the battery with the engine running I believe the engine will continue to run because the alternator will continue to power all downstream electrical components. It would also seem to play into the voltage spike scenario because the alternator would be isolated from the battery (no where else for a spike to go but into the electrical system).
Confused as to what to do here. I hate to disregard the input of my EFI manufacturer, but it seems all wrong to me. Comments anyone?