Grounded circuit troubleshooting

I have a 71 Opel GT with a dead short in the instrument panel lunination
circuit. What is the best way to isolate the ground as it seems that
everything is tied together into one big mess. Are there any free
internet sites that explain basic ammeter use and trouble shooting of
grounded circuits. My experiance with meter use is none and would like to
learn more in this area.

Thanks

.

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