Thread: alternater
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Old 04-08-2016, 06:51 AM   #2
Shoalwaters's Avatar
City: Rodney Bay Lagoon
Country: St. Lucia, West Indies
Vessel Name: "Dragon Lady"
Vessel Model: DeFever 41
Join Date: Feb 2008
Posts: 681
Originally Posted by castellah22 View Post
My alternator on my Grand Banks ,fitted with a Sabre 90 lehman is not charging. Theres talk of a mega fuse fitted, has anybody got any ideas
what may be wrong with it. Many Thanks. David.
What leads you to the conclusion that your alternator has stopped charging?

Your alt probably has two leads going to it: (i) a heavy one which carries the charge current. Probably goes to the starter motor and thence to the battery. (ii) A pair of smaller wires which plug into the back of the alt. One of these provides the current to make the alt work. Start by checking that the big wire is clean and tight at both ends. If there is a fuse, this is where it will probably be. Check that the plug on the little wire fits firmly in the alt. Check that there is 12 volts between one of the little wires and ground when the ignition switch is on and before starting the engine.

OK experts, over to you.!
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