Where do you go for reliable information? The sites here are my go to places for trustworthy advice.
Steve D'Antonio is a former boat yard manager and now a prolific author and marine consultant. He currently writes for Professional Boat Builder and Cruising World. Many of his articles are available on his website as well as his monthly eZine in which he writes about common boating maintenance issues and answers readers' questions. Time spent here is well worth the effort.
The Compass Marine website is a treasure for DIY boaters. Rod Collins, aka Maine Sail, provides a wealth of information on boat maintenance. While competent in many areas, marine electrical systems is his forte. RC is active on many online forums and freely provides the advice and guidance that we all need. He also runs a small store selling products that he has great confidence, Victron Battery Monitors, Balmar products, and his famous Bed-It Butyl tape. Spend some time on his website and support his efforts with a purchase or donation.