Ducato electrics

I have an Eura Mobil camper on a Ducato base 1993 and I have problem electrics. The van is reluctant to start ie loads of relay clatter but no action. At first I thought it was a duff battery so I charged the battery up and it started. But subsequent attempts failed ie more relay chattering diming panel illumination and zilch. Looks like no electrics.
Where can I get a circuit diagram for a 93 Ducato pleaseeeee.
Or anyone got any ideas as to the problem

hi it sounds like you have an earth problem remove and clean the earth strap to the chassis and any others you can find...there are cds of w/shop manuals on ebay look under motorhome parts but i dont know how good they are fiat paper versions were for the garages only be lucky