First, try boosting it. You may have "power" at the battery but it
could be low enough (left the radio on?) that it won't start.
Take the engine cover off. You'll then be able to hear the solenoid
click.

Make a test bulb with a 12v lamp and some 16 gauge wire and a pair of
alligator clips. Hook it up between the low amp input to the solenoid
and ground. (NOT to the large cable!!) Turn the key to the start
position and see if the bulb lights. Yes- the switch and leads are ok.
No, and there is a problem upstream of the solenoid.  Do the same at
the switch to determine whether it's the switch or the wiring.  If all
OK, you can short across the solenoid to test the starter. (it's in
neutral, right?)  Simple process of elimination.
On Monday, August 25, 2003, at 01:52  PM, Automatic digest processor
wrote:

> From:    Tracy Bonin <icculus22420@YAHOO.COM>
> Subject: 85' won't start :-( any clues??
>
> Good Morning everyone, well this week isn't starting off so good, this
> morning went to start the bus and no start. The battery is ok, there
> is power. It won't crank the engine. I realize that means that it's
> either the starter, the solenoid, or the ignition switch. I was hoping
> that someone might know of any tell signs as to which one it could be.
> I don't think that it's the ignition switch, because I had that
> replaced about a year and a half ago, and I know that alot of my power
> options (ie: lights, etc) weren't working properly when it went. I
> know with some cars the solinoid will click if it's ok, but I couldn't
> be at the front and the back of the bus to hear it while trying to
> start.........
>
> please help