Wierd not starting

[Pedrobus]

I e had a gti conversion for about 3 years in my t3 ...
Went to start yesterday and nothing .
Was fine 2 weeks ago???
Put charger on battery and it's full 14.7.
So not battery charge.
While the charger is connected I get dash lights , fuel pump kicks in but nothing more, with charger off I get nothing ??? No lights on dash no fuel pump nothing .
Could it be earth strap I'm confused. Please help , thanks in advance.

[Cecil]

Maybe corroded battery terminals/battery posts.
Might be the battery itself defective if the van has not been driven very frequently allowing the charge level to be minimal over a long period.