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I run 12 gauge from the battery to the M2 with an extra 15amp fuse by the battery. I used some copper speaker cable that had really thick insulation so that it would not get damaged in the engine bay.
Make sure to run the same size wire to your ground point for the M2 (not less).
The M2 has a 15amp fuse built in so another fuse is not necessary but I like to be extra safe. But don't bother if your fuse is above 15amps.
Are you pushing the M2 to it's limit? If not you can go with 12 gauge or smaller depending on the usage but you may want to put a 10amp fuse or something if your system is using 100 watts or less.
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2006 Lancer Evolution IX MR In-Dash PC Project - WIP
Planning:
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Purchasing:
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Installation/Fab/Assembly (Revised):
[----------] 60%
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