You will have 12V on both contacts of the injectors until the DME fires it. This is a short pulse to ground so you wont see it on a multimeter, in the pic it lasts for 2ms, you can only see it with a scope. The pump is running and theres pressure in the rail, it was running before the compression test.
I think its a bad connection from the DME relay to the feed on the injectors so that when the DME pulls the other side to ground the 12V gets pulled down as well so it ends up with insuffieient volage over the injector for it to open. Actually you could prove that by connecting a 12V supply through a heavy guage wire to the feed on the injectors and cranking it.
