6.2 diesel sitting issues
 

years ago I made my account here on diesel bombers after I found a 6.2 gmc jimmy for sale up the road from me, to get advice on the motor.I got good and bad reviews but decided that I'd go for it.I tried negotiating with the guy but he would'nt come down in price, so I had to walk.I was pleasantly surprised to find my diesel dodge in my price range and bought it.Now that old k5 is back up for sale after a year of sitting and he says it wont turn now.If I could get the thing for the right price I would love to have it.Any ideas about what I could do to try and get it started?
heres the link.
http://sfbay.craigslist.org/eby/cto/2756251866.html

p.s. Im only going to pay like $500-1000

Likely the batteries are shot.