Starting problem

[mjp]

I have a 115 Johnson. There is one starting battery and then two deep cycles that run the 24v trolling motor. Off one of the trolling batteries I run the electric down riggers. All the other electronics are operated off the starting battery. The starting battery shows fully charged on the charger BUT when I try to raise the motor or start it nothing happens. If I put the charger on the strating battery I can get it to raise but not turn over when I try to start it. When I put jumper cables on the deep cycle that runs the down riggers nothing changes. When I put the cables on the deep cycle that runs nothing but the trolling motor (which is not hooked up) the motor chanks over good and I could start it if I wanted to. I'm guessing that I have a problem with BOTH the starting and deep cycle battery that powers the deep cycle. Sound right or do I have bigger problems?

[WALLEYE MIKE]

Take your batteries to some place that can check them for "load". Or buy a tester yourself. Some batteries when going bad will still run a radio and such but doesn't have enough amps to start a motor or starter. They take alot of amps while a radio very little.

[TONGA]

Do you have a wiring diagram for the wiring in the boat,,,like maybe in your owners manual? if so would you please post it?
what changes have you made to the wiring in the boat? and did it work ok last year?