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Both engines do need an independent battery. If 1 battery is shared between engines the charging systems on both engines will burn up.
As for the no start. When you turn the key to run do the gauges come alive? Do you have a voltmeter and do you know how to take basic voltage measurments?
I'm sorry I don't follow you. What do you mean by "no volt meter" and then "yes I have test meters"?
Do you have a hand held meter, like a fluke or similar, to take voltage measurements with?
OKay but you do have a hand held meter, yes? If so, are you near the boat now and ready to work?
Okay on the back of the keyswitch, check for voltage on the red wire. What do you show there?
1 motor at a time. To make things simple, get rid of the battery switch and hook 1 engine directly up to 1 battery.
Can you get to the keyswitch and check for power on the red wire?
Okay hold the key to start. Anything on the brown wire?