Perco bat switch problem

[Lancerdad34]

I have had random no crank issues on my 233 merc cruiser the last couple of years. It is so random that it has been hard to figure out. I went through last summer with it only happening twice. In getting ready to launch I wanted to make sure it would turn over. It would only do it on 2. Nothing on 1 or all. Both batteries are fully charged. Should I just replace that bat switch? It is 23 years old.
Thanks,
Brian in Mi

 

[mike_i]

How are the battery cables and the switch contacts? Measure the voltage on the starter with the switch in the #1 position.

 

[Scott Danforth]

Doubt it's the switch. The one in my boat is almost 40

Most likely it's bad cable or bad cable connections

 

[Lancerdad34]

Put boat in yesterday and boat started on both 1 and 2. Go figure!

 

[Chris1956]

Does the ign click when you turn the key, or is there silence?

 

[mike_i]

The problem isn't fixed.