Ok, so i finally get the boat back from the mechanic and went to launch last weekend and it cranked over a couple of times, sounded like the batter was going dead and then click. I took the batteries to where i purchased them from and they checked out fine. I have a 1000 amp starter battery.
Still clicking with the starter not engaging at all. Started looking around in the engine compartment and found the starter solenoid just on top of the engine block. Right next to it is a 50 amp circuit breaker. I took a look at it and one of the wires broke clean off (my super powers of deduction tells me that is probably the problem).
I checked for bad grounds or corrosion in the wires, cleaned them up and still nothing. Checked wires to the starter and they all check out fine. (what a pain to get to!)
After researching this site for info, i think i isolated it to the solenoid and breaker (broken wire and all) although seloc only shows the solenoid and says nothing about the breaker.
Problem is, I'm having problems find a part number for the breaker and the correct solenoid, the breaker is made by Klixon and is a 50 amp with threaded holes. I can't imagine they are the only ones who make this breaker to fit the application. Went to mercruiserpartsexpress and put in my motor serial number and it spits out that the part is no longer available and it doesn't give me a part number for the breaker.
Forgot to mention it's a 2005 350 Mercruiser Horizon Mag MPI, Serial number in the OW300000 series.
If you can imagine my frustration, my wife is pressuring me to sell. Three weekends in a row with not being able to launch is dancing on my last nerve.

Anyone have this info, it would greatly be appreciated.