I am having trouble finding out what exactly is my problem as to why I am not getting any spark. Its a 87 TBI. I am getting power to the power wire on the external coil but am getting nothing out of the coil. I figured the coil was the problem so I replaced it. Now Im starting to think it might be a relay, fuse or something. But I dont know where to start. These damn electrical problems suck. Please help need it urgently as my truck needs to move no later than tomorrow.