Mercruiser 350 mpi petrol motor starting problem

by Ron Garnsey

I have a 1990 bayliner 3255 avanti sunbridge cruiser with 2x mercruiser 350 mpi petrol motors. My problem is that the starboard motor won't start without the port motor running.It appears that the starboard motor is getting 12v to the starter motor from the alternator on the port motor. It is very frustrating and i am not able to find a suitable wiring diagram on the internet. I would really appreciate any help i can get . kind regards

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