Lee,
A trickle charger is just meant to maintain an already charged battery. It  
will not charge a depleted battery to a full charge. Bypass West Marine and go  
to an automotive supply store or a farm supply store like Tractor Supply  
Company. I bought a really good charger some thirty years ago and use it all the  
time. 
I don't believe you ever mentioned the brand of your motor or size. A good  
shop manual will give advice on proper testing methods for you model and they  
are not expensive. There are a lot of things that can affect a starter motors  
performance, but it's always the simple things that will bite you in the 
butt.  Always start your testing from step one and follow through to the end.
 
Rummy



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