2 batteries 1 alternator?

[les g]

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

Just Kampers do a neat split charging doodah

[Davey]

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.

[rich]

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

[carlknight1982]

I wouldnt use a 40amp relay having a split charging circuit on my van i used a 70 amp relay and after a year it burnt out (120,000 miles) Ive just replaced it on hind site i would have mounted it better to prevent it getting hot.

[Talonmotorsport]

Don't worry chaps I've got it sorted now. Truck now has twin batteries using smart split charge system , on board self help jump lead with the aid of a kill switch and I've even added an Anderson connector on the beaver tail so I can run jump leads from the back. So now I can use the rear work lights,winch and jump leads with out leaving the keys in the ignition, very handy for when out on your own or in buisy streets.