American Motors: 65 MARLIN NO BRAKE LIGHTS, brake light switch, master cylinder

Question
WORKING ON 65 MARLIN REPLACED MASTER CYLINDER /BRAKE LIGHT SWITCH NOW HAVE NO BRAKE LIGHTS PUT OLD SWITCH BACK IN THAT WAS WORKING NOW IT'S NOT WORKING/ALSO NO TURN SINGALS NOW PLEASE HELP  THIS IS MY BOSSES CAR  THANKS PAUL

Answer
Do you have power at the switch? If not, check the fuse and wiring.
Remove the switch, cover the hole with a cloth and have someone slowly apply the brakes. Does fluid come out under pressure?
If not, there's your problem.
Did you bench bleed the master cylinder before installing it?