Battery relocated to Trunk

2010 Mazdaspeed3. Ran into a big problem… I fully built my engine did lots of bells and whistles and finally went to start my car hooked up battery everything was good. Went to turn on my car and i have zero power, no lights nothing… I’ve checked to make sure all my grounds are connected double checked and triple checked I’m lost at what to do now. Im no electrical magician and cant think of even where to start. Any help would be amazing i want this thing to run lmao


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