you wrote you were looking for '54-'56 information...
You have a '53... the '53 is different from a '54-'55 truck...
the body style went '54-'55 1stseries, then '55 2nd series was an all new truck, body wise... check the gallery section for plenty of pictures for examples.
this is for a 1955 second series:
http://chevy.tocmp.com/1955truck2shop/index.htm Do you have a later model engine in your truck?
the 6 volts stopped in the 55 1st series or was it the '54? - I know the '55 2nd series was a 12 volt unit... someone around here knows.
-W