I gotta ask,
Duckhunter you have been posting a lot lately does ANYTHING work as it should on your boat???
Way to many elementry problems for it to be a fluke..........
Who has been workning on this boat and what did they do to it to cause SO MANY ISSUES!!!!
You need a manual first off........
There are two solenoids in the starting curcit, one is a slave the other is on the starter itself.
the slave has four wires, two large ones go to the top two terminals, the two smaller ones are BLACK = ground and yellow with a red stripe = crank over.
if you determine which top RED wire is hot all the time and simply jump from that wire to the yellow with red stripe and the engine cranks over then it is your key switch or wiring harness. If it does NOT crank over then it may be the slave solenoid it self.
the starter solenoid has a large std with at least two large guage wires attached, there is also a small connection with a yellow with red striipe going to it.
repeat the jumping from the large terminal (battery connection point) on the starter to the yellow with red stripe this should also crank over the engine. if it does not do it from this point then you either have a bad starter, bad ground, bad battery or an internal engine issue.....
First rule of owning a boat...........have at least two starting batteries one in the boat and one fully charged as a spare........
Deep cycle batteries are typically for electric trolling motors and not for starting a engine,
there are dual purpose batteries that say they are a bit of both, Mine says this.......NAPA 625 CCA starting/deepcycle..........$90.00 +