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markwinsta
markwinsta

Posted: Sun Apr 10, 2011 7:01pm

Post Subject: Incorrect Polarity

Hi Tony, Whilst recently carrying out some work on my boat fitted with a Shire 40 that required relocating the engine start battery, when replacing I committed a school boy error and connected positive and negative the wrong way around causing the possitive wire from the engine start alternator to the starter solenoid main connection to burn out. I realised something was wrong and immediately (approx 10 seconds) switched off the isolator and disconnected the battery. I rewired the damaged cable and re-connected the battery (the right way around this time) then turned on the isolator. Instruments and buzzer operated as normal, but smoke came out of the alternator, whereby I immediately turned off the isolator without trying to start the engine and disconnected the battery. I am advised that the Diodes are probably damaged and possibly the windings, therefore I have isolated everything and removed the alternator for specialist examination. I am wondering if any other damage has possibly been caused, or can I have the alternator repaired, then re-connect everything. The domestic side, inverter/charger is operating as normal. Regards, Mark

Tony-B
Tony-B

Posted: Sun Apr 10, 2011 7:33pm

Post Subject: Incorrect Polarity

Anything electronic that is live with the ignition off may be damaged. On standard twin alternator boat this is probably only the alternator. On a split charge boat with any form of electronic or diode charge splitting the charge splitter may have been damaged. If you have an advanced alternator controller then that may have been damaged as well, but it will probably only be the alternator. Get a quote for the repair and check that against the cost of a Lucas A127 of similar output. It could be cheaper! Tony Brooks

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