I'm going to disagree with Brian's assessment slightly. Melting of the wires is from too much current flow. That *could* mean a direct short to ground but not necessarily.
It just means the expected resistance in the circuit was less than specified. It sounds like a couple loads found their grounds through the ECM. Very similar to my buddies Corolla that would melt his clutch cable because of a bad ground connection between the battery and engine block.
I agree, wire carrying to much load because proper wire is broke or missing is a likely problem as well.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
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