To see if it is the starter I would take a hammer and tap the starter a couple of times and then see if it will start. If it does then you know its the starter.
Sometimes that will work if thats it. I have done that every time I have any doubt on it.
Do you have a separate Voltage Regulator on it still?
 
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'92 GMC Sierra, Sportside, 2wd, 350, Black
'92 Chevy Silverado Extended Cab 4 x 4, Blue
USAFR = 2A674 = Aircraft Fuel Systems Maintenance
i.e. Tank Rat
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