Ive had my Disco for 5 yrs now a great runner ,but a bugger to start ,only a couple of months into ownership i put on a new battery and ok for a while ,then the cold weather came and bosh carp startin' again, so i bought another and kept them both charged up, but once again they started to fail, so with that i cleaned all the charging circuit, had off all the earth straps, and checked the alternator, that was fine. put in new heater plugs and the effect was the same ,carp startin'
So i lashed out and bought a Optima Red Top starter battery ,and since then not a problem , it will start without the heater plugs ' if i had done this earlier i could have saved myself the cost of two batteries and my time..