Outer Limits 4x4 Board

Just recently my 2.4 diesel hilux has been starting really crap. As in it takes for ever to start and sometimes you have to use the glow plugs abotu 3 -4 times. I replaced the glow plugs 2 days ago and still no help the battery is only 3 months old and is a 13 plater high cranking one. However it still turns over slow.
Could it be
A: alternator isnt charging properly?
B: Glow plugs arent getting enough voltage?(currently only getting between 7-8)
I cant seem to think of why it would be doing this and even after leavign the battery on charge for 1 and 1/2 days it still didnt turn over any faster...
so any help is greatly appreciated because i thought i'd try hear before going to an auto electrician
regards batcho101

Starter motor?

yep i jsut found the problem then i was turning it over when someon pointed out that a light was flashing underneath so i got dad to watch and it is the starter motor some of the points musn't be touching and it is jsut arching out...so now where is a good place to get a starter motor reconditiond in brisbane