Ox-66 not starting

[Rlbol]

I have an ox-66 250
It has not been started in some time. Charged up the batteries and went to start and nothing. Gauges will not even come on. You turn the key and nothing. There is power to the engine so I am thinking it is the ignition switch? I am getting ground and power via the red wire. How can I trouble shot and by pass the key switch?

I am getting ground through both wires to the safety switch which I assume is correct?
I have also checked the fuses and all are good.

Thanks for any help

[boats.net]

Check fuses on engine one may be blown.

[Rlbol]

Thank you
I checked both the large fuses as well as a smaller one in the same case.
All three were good? Is there possiable fuses somewhere else?

[jb123]

test voltages with meter, need 12+

[Rlbol]

Thank you jb
Where should the voltages be checked?
I have over 12 volts at both batteries
12 volts at the red wire at the key switch
And 12 volts at the main cables on the engine
Where else should I check?

[jb123]

check for corrosion at main harness ends,motor and key side