Just an idea here, I had the same issue when I installed my headers. Fortunately I had enough forethought to cover it before it melted to the header.
If you have a hard time getting it away from the header, NAPA sells a high temp silicone tubing that will not melt or burn. I bought one foot of it and slid it over the cable down by the starter and even if it does rest on it, it won't melt.
And I know for a fact it won't melt, because I brought it home and fired up my hot wrench and tried to melt it, no go.