Momentum warranty in General Motoring Issues Posted August 20, 2012 Message displayed in car today - warning light that battery not charging - phone my pal who is a mechanic - confirmed that it would be the alternator. Got in touch with the garage I bought the car from 8 months ago. Booked in and after they check, they confirmed it was the alternator. Part is covered but the garage are trying to change me £ 57 for the privelage of telling me what I told them. Come on - cant be right?