I have a 71 charger. Drove it yesterday, got home noticed no brake lights. The turn signals work on rear, running lights work rear, all marker lights, and dome light works. I checked brake light switch and it is working with test light. Also checked plug in trunk with test light and everything checked ok except brake lights. According to other posts I am leaning toward turn signal switch. How big of job is this and any directions would be appreciated. Thanks!!