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MaineSail/Compass Marine, who has the excellent photo-how-to-blog has some butyl tape for sale here (tips on how to use it in his blog above): http://www.pbase.com/mainecruising/butyl_tape

Looks like he's got his own maintenance forum going these days too: Musings With Maine Sail

Thanks Mike!

If you do connect the yellow and red separately, I suspect the 12V yellow power for memory and the clock is likely in the milliamp range and therefore not likely to drain your battery during the active part of the boating season (your manual should have a value printed)

Yes the memory drain is very, very minimal:

My guess is that you did not install a solar charge controller. Basically at night a solar panel will work in reverse and drain your battery that's why you should always have a charge controller installed to prevent draining.