Driving down the road the other day I lost my blinkers and emergency flashers. Looking at the fuse block the radio and b/up lamps fuse blows as soon as you turn the key to run position. Any ideas or diagrams. The headlights function and so does the switch. There's an aftermarket radio in but I believe I've disconnected it and it still blows the fuse. Any advise? I'm not much of an electrician but manage. How do I track this down