Another problem with the plug

[Vaines]

I am in front of the yellow digging machine, the cable is in the control panel, as is the key, and the fuel in the tank. I also checked a walkthrough in the case i missed something but they don't say anything more...I even got a call from Red about how "Truth is relative bla bla bla"...so i thought it was finally done. But each time it says "there is no power in the control panel"...Can anyone help? Is this a bug?