why wont my 1995 honda odyssey start on 1995 Honda Odyssey

My 95 honda odyssey wont start notice it was not wanting to start for a couple weeks but always ended up turning over i backed out of my drive way put it in drive and then the lights went dim for a second and my van turned off battery still works but van dont want to turn over.

Asked by for the 1995 Honda Odyssey
hav ebattery charged and then load test it,then have charging system ck'd also.sounds like alt issues