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raypeck
raypeck

Posted: Sat Aug 14, 2010 5:21pm

Post Subject: charging of leisure battery

Having asked question ofcentral heating system, Son now finds that his lesuire batteries have got flat on him, he has charged them from a small mobile generator today and got them up to 12.4volts. Thge alternator idicator lights is on bright but when he starts the engine the voltage to the batteries remains at 12.4 volt indicating to me that the alternator is faulty, but I am a bit confused if there are additional controls associated with it that may also be causing the problem. Alternator is a Lucas Marine A127.55. Engine alternator is giving over 14V. Thanks for your help. Ray

Tony-B
Tony-B

Posted: Sat Aug 14, 2010 6:17pm

Post Subject: charging of leisure battery

Dear Ray, First of all 12.4 volts is normally considered just a little above fully discharged so he needs far longer with his generator and most generator 12volt outputs are pretty useless for battery charging. I would advise that the generator is used to drive a mains charger. You talk about "engine alternator" giving 14 volts so from this and you saying the warning lamp stays bright makes me think you have two alternators and on the face of it I agree that the domestic alternator seems to be faulty. The A127 has an integral regulator and requires no other equipment, however we are back to not knowing what the previous owners may have added. There could be some form of advanced regulator but that should not prevent the alternator energising and putting the warning lamp out. The alternator will have one or more THIN wires connected to it. take care one of the big terminals is connected straight to the battery positive so you do not want to short that one to any metal. With the engine stationary and the ignition on carefully remove each thin wire in turn. One should put that warning lamp out and if it does not you probably have a short to metal on the thin warning lamp wire. this would prevent the alternator charging. It is possible someone has put the thin wire on the wrong terminal. Normally the connection is labelled D+ or D. Tony Brooks

raypeck
raypeck

Posted: Sat Aug 14, 2010 6:39pm

Post Subject: charging of leisure battery

Thanks once again Tony, alternator was working OK on trip down from Daventry to Brentford but he left something on last night and the batteries were flat, I am now pretty sure that the generator is US so will try and source on Monday for him (have to pay him back for damaging his pram cover on a bridge and driving into bank!!!)

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