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Remove the blown fuse and measure
the resistance between the load side of the blown fuse and
the earth. Close the switches of all circuits which are
connected to this fuse. If the resistance is almost 0
Ω
at this time, there is a short somewhere between these
switches and the load. If the resistance is not 0 Ω,
there is no short at the present time, but a momentary short
has probably caused the fuse to blow. The main causes of
a short circuit are the following.
- Harness being clamped by the vehicle body
- Damage to the outer casing of the harness due to
wear or heat
- Water getting into the connector or
circuitry
- Human error (mistakenly shorting a circuit,
etc.)
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