Luis R

I have an 08 Yukon Denali XL 1500 6.2l V8. My drivers side running lights, tail light and yellow bulb in headlight (signal bulb) blow the fuse. I've replaced the fuse many times. When that didn't work I got under truck near taillight and found where it grounds to body. It was really corroded. I cleaned to metal and reinstalled the ground and it's still blowing fuses. I couldn't see any frayed or bare wires. Any ideas would be a big help. Thanks in advance