Help!!!!

I am guessing you have a bad ground somewhere. Is your engine grounded to the frame? I added extra grounds to mine from the heads to firewall. Try using a set of jumper cables from the negative battery terminal to a solid (unpainted metal) surface. If the starter relay is bolted solid to the fender and it's free from rust and paint under it's mounting bracket then try connecting the jumper cable to the body of the relay. If this solves your problem then add a ground strap from the engine to the firewall. Good Luck