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Some vehicles may have load drawing solenoids that become defective causing overload on the current carrying wire causing it to over heat and burn. Another cause is bad connections on terminals. Some wires carry heavy loads of current, therefore, causing a hot spot at that bad connection causing the wire to over heat and burn. Still other causes could be bad alternators, heater blower motors, radiator cooling fans, etc... All these are load drawing components and should be looked after.

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Q: What are some causes for burn out of wiring harness?
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