[pjmoreland]

It sounds like your turn signal switch might be shorting to ground the white wire that comes from the brake switch, but only when the turn signal switch is somewhere between off and on. You could confirm this by using a continuity tester between the white wire and ground while you move the turn signal switch back and forth slowly between off and on. The question then will be where is the ground connection? Maybe something in your turn signal switch is touching the steering column housing. Also, you could check for any connections to ground on all of the wires in the curved turn signal switch. If you unplug the two halves of the curved connector and check for continuity between the black/white wire on the switch side of the connector and ground while you move the switch connector. This will tell you if the problem is in the switch itself.