As far as I know your codes would mean this:

Code 12 = battery disconnected in the last 50 or so starts

Code 54 = no cam signal (the under the distributor cap CPS is bad or has
a dirty connection)

Code 33 = bad AC clutch relay. (if you have no AC, this is normal)

Code 55 = end of codes.

These are from this link:
http://www.allpar.com/fix/80s-codes.html

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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