http://www.nabble.com/file/p25249957/PICtoI-PAC.jpeg > You appear to have the emitter and collector of each opto output reversed Also, is there a reason the "+ volts from programmer" is included in the diagram ? It's not clear, as some connection lines skip the ground and +v lines, some don't -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist