here is a diagram of what i believe to be the channel mod you have done to your grant XL.
it is the most common one.
http://www.cbtricks.com/members/cblincoln43/Poormans_Conversion.gif
now, as for which switch on your radio is 1 and which is 2, thats up to you to figure out. LOL
have fun.
PS-back when you were into CB, did you do your own conversions or mods?
im asking because there is a mod to the receiver of this chassis that will make it even better than it already is.
replace one transistor and four diodes.
ill post the info if you are interested.
as far as i know, this mod originated with the Uniden Grant XL Owners Club.
LC