What do you base your statement 'battery good' on?
Has the battery been fully charged with a battery charger & have you rechecked using a known good fully charged battery?
A very rough guide to battery state - bearing in mind a recently charged battery needs to be allowed to stand.
http://www.thebatteryshop.co.uk/car-...guide-34-w.asp
Check & clean all terminals - if the battery terminal clamps are the type with screws holding the cables in then remove & clean the cable ends as surface corrosion on the cable ends can stop full voltage being supplied. Guess how I know that one. They're rubbish & need to be replaced.