When I converted my truck to 12 volts I thought I would save myself some money and not pay what some of the vendors wanted for a "D.A. plug". So I went to Pep Boys and bought a delco alternator plug. Got it all wire up, but when I went to turn off the truck it wouldnt shut off with the key.
I came to find out that the aftermarket D.A. plug that the vendors sell has some kind of diode wired into the unit that allowed me to shut off my truck with the key.
