Hey everyone—I'm a newbie here and hope someone can help with this problem. I have a 1970 Mustang coupe which was recently painted and I'm putting all the lights, trim, etc. back on and I've run into the following problem: when the headlamp switch is on (in either position) both turn signal indicators on the dash light up and all side markers are dimmed. Otherwise the dash turn signal indicators, markers and emergency switch functions are normal... with or without the headlamp switch on. I've traced all wiring and found no problems and the ground connections appear okay. I disconnected the turn signal switch harness and the dash indicators still go on when the headlamp switch is turned on. The problem is ONLY when the headlamp switch is on. All wiring is original Ford. Any help will be greatly appreciated. Many thanks in advance.