When i turn the key the buzzer for the air breaks sounds but there is nothing else the engine wont turn over at all. its like the battery's are flat but i have charged them and the isolater switch is working! what else could it be??

Sandie, July 2014

Do you have good connection on your battery earths, I would. remove
your batt to chasis earth/ground conns and emery cloth or touch with grinder' also batt conn/terminal, if you havent already done so.You didnt say if your panel lights stayed bright, or dimmed when the key was turned.
Hope this helps.
Colin

colin, July 2014