check engine light came on

i installed new radio 4 or 5 days ago , last night my check engine light came on, today i had taken to a mechanic shop and had a diagnostic check
and it scanned out to be a fuse problem so i then went home to check my fuses in glove department and trunk but didnt find any blown fuses , did i miss any other places were fuses are located or does any one kno what may be the problem. ?
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How much juice does this radio pull?
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