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Message: <blockquote data-quote="Allen" data-source="post: 259384" data-attributes="member: 389">I initially read this and thought "what a great idea", and have now reconsidered.  A couple years ago I had to have the charging system on my Yamaha 4S fixed.  It turned out to be the rectifier/regulator. After doing a little reading on this I found out that one of the easiest ways to wreck your rectifier is to disconnect your battery while the motor is running.  And wouldn't you know it, I had done exactly that the previous year.  Basically I went out with a dead battery and no jumper cables, so I temporarily replaced the starting battery with one of my trolling batteries to get the big motor started, thinking I'd be able to quickly swap the original starting battery back into place after the big motor was running.  Uhh, no...as soon as I disconnected the battery the engine died, so I just went without an electric that day.  Anyway, this was in the fall and I didn't think much of it until the next spring when I started having troubles with the starting battery not holding a charge during the day.Anyway, the moral to the story is that while you'd be able to remove the nuts and install this to your trolling batteries, you would probably not be able to attach to start the big motor because you'd be running the risk of interrupting the circuits and frying your rectifier/regulator while removing this homemade jumper system after you get the big motor started. Maybe there's a mechanic on here who can elaborate on this better, but what you're talking about seems awfully similar to what fried my electrical system when I'm thinking there's a risk of breaking the circuit between the motor and battery while the engine is running.</blockquote>

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