Yongnuo RF-603 trigger question

Suntan wrote:

I do exactly what you are doing.

You need to have one 603 mounted on the camera hotshoe and you need to have the camera trigger cord plugged between the mounted 603 and the camera sync port. Further, the camera needs to be on.

FWIW, you can press the button on a 603 that is connected to a remote flash and still make the camera/flash group fire. If you have the connection/sync cable that goes between the 603 and your particular camera, you can test it with just the two 603s you have.

Just hold the remote flash in your hand and press the button on the flash mounted 603. The camera should fire and sync with the flash in your hand.

-Suntan