Through the years I have seen this problem before. Why do the lights in the dash come on when I apply the brakes in my 69 Camaro? I have added extra grounds, still they come on when brakes are applied. The first time I ran into this problem was back in 1962. That time it was in a 54 Chevy pickup. Any ideas appreciated!!
Are you saying the running lights don't come on with the brake depressed?Since it's not the bulbs,I would buy a turn signal switch,and just plug it in,dont completely install it.If it doesn't fix it ,return it.