I have a 70 Honda CL350 and I have been trying to trouble shoot the tail light. The brake light functions work correctly but the tail light only comes on when the headlights are switched off at the handlebar switch with the key in position 1. The schematic shows the brown wire to the tail light coming directly from the ignition switch. When I unplug the headlight (white wire) in the bulb housing the tail light goes off even when the switch on the handlebars is off, when it normally works. The tail light should turn on when the headlights are on. The tail light comes on with the ignition switch in position 2.