Try these
www.haynes.co.uk don't hold out too much hope though as Haynes only produce manuals when sufficient cars sold to justify printing. If the car is high mileage could be alternator worn out. Take it to a shop that does alternators/starter motors/batteries etc and ask them to check it for you. If you have got a voltage tester you can check alternator output yourself, connect tester to battery and start car, rev to 1,500 revs and voltage should be minimum 13.8 volts.