Thanks for all the replies guys.
That link of traveldawg's is a winner.
Search the bulb number and get the voltage and wattage in a few seconds.
Turns out a 922 is 12W while my original 921 bulb is 18W. 922 should make a nice low light nightime bulb for the potty. Now I won't get blinded during someone elses *ahhmmmm* night time trips there *LOL*
Regards to all,
2004 Dodge Ram 5.9L Cummins HO, Auto QC 4WD SRW LWB....2004 HitchHiker II LS, 30.5 RLBG, Dbl Slide....2005 Sandpiper Sport 19ft T21 toyhauler