^^^ Well that is certainly is an easier way to check the cable then cutting back the insulation though I would be wary if any more then .1 volt difference and also would be sure to use a quality DVM.
That being said, in and of itself, it is not difficult to carefully slice the insulation and then tape it back back together.
Some of the pix showing the corrosion underneath the insulation are simply mind blowing due to the AMOUNT of corrosion. NOT sure if Chrysler used some under par wire, or if other factors are involved in those cable that DO corrode, but it is a relatively common occurrence on our trucks. Well, I am not sure if "common" is the right wiord or not, but it certainly HAPPENS!!!