Date registered: Nov 2014
Vehicle: 1990 350SDL, "Grandpa's Roadster" Project Car
Location: New Hampshire
Mentioned: 9 Post(s)
Quoted: 792 Post(s)
The battery light has Battery positive to one side all the time,
Yes, and the exciter diode pack keeps the battery from discharging through the idiot light when the key is not supplying 12 volts to the other side. Otherwise current will flow from the battery through the light and then through anything else connected to that circuit on the ignition switch, to ground.
"Real engines don't have spark plugs!"