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#1
15th January 2011, 05:19 PM
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Think unless you have a high output alternator it may struggle ..the smaller of the two batterys will always draw the charge current before the larger one does (to work the two batteries must be identical)...might be easier to get a new transit battery ...
Just my opinion someone my know better though !! 
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#2
15th January 2011, 07:19 PM
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What you need is a split charge circuit, a feature of all motorcaravans. Quite simply it is a relay between the positives of both batteries. The relay is usually energised by the D signal from the alternator. Your alternator should be quite capable of charging two batteries. An alternative is to use a voltage sensing relay. This simply fits between positives of both batteries but when the engine battery voltage rises due to alternator charging the relay will detect the increase in voltage and close to couple both batteries together and allow them both to charge. If you need more info or a wiring diagram just ask
 .D.
__________________
visit my website at www.cossie.davenewell.co.uk
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#3
16th January 2011, 11:20 AM
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like davey says. ebay split charge system they are about £15-20
__________________
My Roadster Is Finished NerNer....... Pigs can fly, you just have to carry them onto the plane. My Pictures http://s707.photobucket.com/user/ashgardiner/profile/
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#4
16th January 2011, 12:02 PM
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Phil have a look on some of the marine websites you can get some nice battery change over switches this allows you to charge both batteries
and isolate each in turn so that you could run your lights or winch off one then turn over to the other or bring both into use at the same time that way you will always have one battery fully charged HTH cheers les g
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#5
17th January 2011, 12:03 PM
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Just Kampers do a neat split charging doodah
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#6
17th January 2011, 12:42 PM
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A split charge system doesn't need to be anything special, a 40 Amp automotive relay, two 30 Amp fuses and holders to suit and some heavy-ish wiring will do the job nicely.
D.
__________________
visit my website at www.cossie.davenewell.co.uk
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#7
21st January 2011, 07:08 PM
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if you want to use the second battery to jump start the transit you need to link the battery to the vehicle battery with heavy starter cable via a master switch with a 250a minimum rating. The alternator will charge both batterys with the switch joined and you can split the batterys when using the winch.
if you want to do this with a flick switch on the dash you can use a electromagnetic master switch
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