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I'm a boating newbie so please forgive ny ignorance on this. I bought the boat last year and it ran fine.

During the winter I took the battery out and stored it in the garage. I'm pretty sure that if the wiring to the battery terminals was in any way complicated, I would have made a note of it.

Anyway, the problem is that when I connect the wires to the positive terminal, the battery sparks when I turn the ignition on and nothing happens. From the photo you'll see that there are three wires which (I believe) should go to positive. The large red one, the black one (ending in a green cap) and the red one (ending in a black cap). If I just attach the large red one and the black one then the engine will start but I get no power for the engine trim or the bilge pump etc. If I just attach the red one, then that gives power to the trim etc but, obviously, won't start the engine. The problem occurs when the red one is attached along side the other two.

What am I doing wrong? I know it must be something simple and I feel an idiot for asking!

Thanks for any input.