Hows your alternator if its poor ,it might have killed your other battery...and flag up faults on dash due to low output:eek:
 
More update on over heating issue , been towing for a good 40 mins no overheating issues which is excellent news , but I've got a bloody gearbox fault now .
ABS light comes on briefly , gearbox kicks down and gearbox fault comes up it cut out once but managed to get it home but getting concerned gotta tow caravan in 2 weeks time for holiday

Gearbox overheat?
 

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