Yesterday I was driving on road, accelerating smoothly and get error "electric loads switch off" no heated window, seats was turned on...only TV and lights. Everything looks fine (including voltmeter 13-14V).
Today I get same error but Voltmeter doesn't show any more charging - below 12V only.
I drive some miles and get air suspension and 4wheel lock errors too(probably low battery voltage)
Has anybody clue, where is the problem? (nearest service is 100miles away and they dont work at weekends)

 

I got the 4 wheel drive system error once when driving in the snow...but when I turned the truck off and back on, it never came back...I just assumed it was a one time error.

 

Same happened to me before, it is either due to bad cables from battery or a died battery. Go to the dealer...