The brown wire does connect to the last terminal on the regulator, it is the indicator light circuit (idiot light on dash) and needs to be connected for the alternator to work. Some vehicles do not have a dash light and the brown wire is connected directly to the ignition circuit through a resistor wire imbedded in the wiring harness.
Thanks so much for the reply sweepleader. My C60 has a amps gauge which used to work. So hopefully when I hook the brown wire up my gauge will work again. Thanks again for the reply.
