Rick, you don't need a resistor. Good job on reporting the flasher.
You are not really after the bulb number. It is a 6V bulb or it would have burnt out already. To save some work and time. just buy a 535 flasher and plug it in. It is also a 3 prong flasher. If it solves the problem, you are done.
If not, you will have to check the bulbs AND their sockets.
FLASHER HOOK UP:
X= TO BATTERY
L= TO TURN SIGNAL SWITCH
P= TO "PILOT LIGHT"/INDICATOR ON TURN SIGNAL SWITCH........ If you have other indicators somewhere, that could cause a problem.
By the way, the turn signal switch/clamp needs good ground to column.
I think the only place to get that same flasher is used or N.ew O.ld S.tock. Don't bother, neither option is reliable. It is a genuine GM Part. Advertised as 46-54/49-54
