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That depends on weather its on the mains power supply or not

Mains supply is things like Alternator-Starter motor solenoid anything which as power to it when ign switch is switched off

As other power is when ign switch or light switch is turned on ,,as a dead short in second power will blow a fuse (mains power wont).

Fit a amp meter and a volt meter to battery pos term and read both then.

If in the switch side turn on the Parker's and re move light plugs 1 at a time back and front both meters will drop the same each time,, if 1 of the fronts or rears drop a lot then that could be your problem .

But if nothing and all is good then its in the Constance feed i.e. Alternator etc ,But if the battery drops down in volts over night ,then disconnect it from the earth lug and check it next morning as sometimes its the battery only doing the problem.

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Q: How do you find a dead short in an electrical system?
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