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Mhans

reversed battery Connections-Merc bravo III

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.distracted and preoccupied..last evening, I placed both batteries in my 2011 Sunesta 264 and attached the cables trying to beat the setting sun....All was well until I turned the battery switch on and a brief spark across the VSR module was seen. And no power.... After I briefly panicked, I looked into the battery compartment and my horrified worries were confirmed. I had dropped the batteries in "backwards" to the way I had taken them out and attached the yellow ground cables to the (+) electrodes and the red positive cables to the (-) posts on the batteries. Removing the cables and reattaching them correctly now only gives power to most of my accessories/lights/horn/blower,etc. BUT I have NO power to the dash guages/trim/tabs and NOTHING happens when I try to crank the engine. I have looked at all the fuses (that I can find) and they are fine. Circuit breaker not tripped. No breakers tripped on panel behind dash.

So... Alternator??...starter???..blown diodes somewhere else? ..VSR module?

Thanks

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Well one of my scariest moments on my first real boat (not the chap) came when I hooked up the battery backwards and turned on the switch. The minute I did that, the alternator caught on fire and burned itself out. It was also getting dark and I was distracted talking to my "mechanic" as we were working on the boat together. I felt so stupid, but luckily only needed a new alternator. Keep in mind this boat was carved. With your computer systems and what not you may be in trouble...there's No way to know. Can a battery kill itself? Did you smell anything burn or fry itself or just a spark show on the battery terminals?

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