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Posted: Tue Jul 12, 2011 8:57pm

Post Subject: Battery safety

Tony, Can you please confirm that when disconnecting batteries you should remove negative first and when reconnecting it is reconnect positive first. Thanks

Tony-B
Tony-B

Posted: Wed Jul 13, 2011 8:45am

Post Subject: Battery safety

No, I can not - unless you supply much more information about you boat. It is now far from simple. If you have a wooden or GRP boat and there is no chance of the spanner being used bridging the positive terminal to any other chunk of metal that is connected to battery negative then the probably safest answer is undo the positive first. However it is at all possible to make that bridge, a st would be on a correctly wired metal boat, you could easily cause an explosion, fire, or suffer serious burns so things are far from straight forward so you will need to work through the following. If the boat has the battery isolator switch in the positive and nothing save a bilge pump & radio bypasses them then turn the isolator off and undo the negative first. In the same setup but with a high current device or other sophisticated piece of electronics that may be turned on then either ensure it is turned off (as well as the isolator) and undo the negative first. If the isolators are in the negatives and it is a very simple electrical system then with the isolator off you can undo either terminal first. Again with negative isolators but a sophisticated system undo the positive first BUT take the greatest of care that you do not bridge between a positive terminal and any metal. By and large if no inverters and such like are involved it is probably safest to undo the negative first on a metal boat. If you can ensure EVERYTHING is turned off it is probably safest to undo the negative first, but if there is any doubt take the greatest of care and undo the positive first. However remember just one slip of the spanner and you could be in trouble. Tony Brooks PS I would always make sure everything is off and undo the negative first on a metal boat.

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