I have a 93 K3500 w/ a 7.4 and an NV4500 with the 8747 PCM. I've had a lot of strange problems with it and I was hoping to check some wiring things, starting with the grounds. Where all are they located? I'm only familiar with the ones that are on the thermostat housing.
How do I check them? I took one of the ones off of the thermostat housing even though they both looked good. I accidentally broke the ring terminal so I cut it off, stripped it and installed a new ring terminal. As I was doing that i discovered that the last 1.5 inches of the wire (or so) had melted insulation which made it difficult to strip the wires. It also appeared that it had very slight amount of corrosion in that area. I never would have seen it unless I had accidentally destroyed the ring terminal. I'm convinced even a close inspection would have yielded no indication that there was anything wrong with that wire. Ever since I fixed that, the brake light quit flashing a RWAL brake code like it has been consistently doing for months.
So how do I check other wires in the system (especially grounds) without cutting every wire open? And like I mentioned above, where are all of the grounds supposed to be? Thanks.
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