Positive going through a relay and fuse to the injector. And negative going from Speeduino through a 5 ohm 25w resistor to the injector.
The problem is that I can use the hardware test page to turn on any of the 4 injector channels, but which ever output the injector is connected to doesn't light up or click the injector.
I have verified the wiring (multiple times) as well as unplugging the connector from Speeduino and directly grounding the injector pin from there that it clicks.
So what could cause Speeduino to not be able to control the injector?
And it is a fuel injected old Lada 2105 with a tbi style throttle body, gm iac, iat, clt and tps. Using 60-2 trigger wheel and vr sensor etc. Everything regarding to the sensors/spark is working, although I don't think that any of this has anything to do with Speeduino not being able to open the injector.