2002 EC300 wiring for lights

[Neil E.]

Keep in mind a meter draws very little current to operate. You might have just enough connection to work the meter, but not enough to light a bulb. This usually means a poor connection or multiple poor connections. It is not unheard of to have a break inside a wire that otherwise looks good.

Does the stator look good or is it a rusty mess? Floating the ground does make it a lot simpler as it takes the engine/frame connection away. Did you measure the resistance on the windings? Bad solder joint on the stator?