I could certainly believe that heavily modding could result in an error in wiring or failed third party appliance or "mod" leading to subsequent fire. The 12 Volt Lead/acid batteries in our cars are capable of putting out massive amounts of power all at once (cold cranking amps), in some cases over 8,000 watts and approaching 10,000 watts (typical microwave ovens produce about 1500 watts). They can produce enough current to weld steel and melt copper wiring, and sparks that can jump several feet away, any of which can quickly ignite flammable materials in the vehicles.
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