Originally Posted by RHDNEAL
Well i did a voltage drop test when i got home and the culprit was the negative lead on the battery the terminal clamps are those cheap advanced autoparts post clamps, covered in red and black paint and little to no surface area for that large of a guage wire. So i picked up a new wire harness that goes from the battery to both + and - and the starter and the inner fender under fuse box. Problem solved in about 5-10 minutes...PS dont use advanced auto parts battery terminals!!!!
That was my guess since I had the same problem last winter in my GC. Glad you got it fixed, I know this car.