787 msd ignition not powering on

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Brprxt215

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I built a limited class boat over the winter and went to fire it up today. I put the key on and only get one beep. I opened up the grey box and the msd is not lighting up. Any tips or advice? Thank you.
 
Its been a while,,,double check the wiring diagram,,,the msd needs battery juice, and coil pulse,,,,happened to me once,,had it wired for a 720, and have a 800.
 
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