I had a bad engine fire start by bad wiring of the second battery from the previous owner. The main connecting positive ran across the alternator then across the block to air con compressor and then to the second battery. the vibrations from the engine wore through the insulation, engine in earthed so sparks and fire ensured. After this i re-ran the wire without it touching moving parts. I sold the car 6 months later but didn't experience any issues in that time.
pic related; new wiring.
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