periodic short in electrical system.

[lrickert at covad.net]

my 87 4kq has started blowing the #12 fuse the last couple of days. The fuses 
have lasted from minutes to hours of driving with no real clue as to why they 
blow. So before I dive into it does anyone have a suggestion of where to start 
looking. This circuit carries such things as the instruments, turn signals (or 
at least the clicker any way) diff lock panel and who knows what else. I think 
the pervious moron of an owner wired the radio through it as well and I don't 
know if he used an inline fuse for it.  I do have the manual but still it would 
be nice to have a little direction in my search if anyone else has had a similar 
problem. I think this is the first electrical problem I have had with this car 
in four years. 

thanks

Luke