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U disconnect the NEGATIVE battery cable & put a 12Volt test light IN BETWEEN the cable & battery post(connection) THen U start pulling fuses un- till the light goes off MAKE SURE U have ALL switches & doors shut because (doors-radio-etc) will turn on the test light.IF IT still doesn't go out after all the fuses have been pulled-THE problem is in a HARD WIRED CIRCUIT like the HEADLIGHTS etc.

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8y ago
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12y ago

To save keep blowing fuses or causing more damage, it is better to use a multimeter, set to resistance to check the power supply.

Working with a circuit diagram, try to eliminate sections of the circuit by disconnecting them.

Zero resistance across the power supply rails will show that there is still a short.

Remove complete sections of the circuit be removing a convenient wire link, or at the extreme, you can cut through the printed circuit and repair afterwards.

It all depends what kind of circuit you are working on, from delicate electronics to heavy electrical plant.

Try to work methodically so that you don't retrace your steps, or be fooled into thinking something is clear of faults when it isn't.

It definitely helps when you have a clear understanding of how the circuit should work and can read a diagram.

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Q: How do you trace a short circuit that's draining the battery?
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