I have a NP300 in mexico they are sold like the D22 also, The issue im having right now is that the truck runs rough, as i accelerate it shakes and knocks, i can also see some white/blue smoke. As i hot wire glow plugs directly to the battery the truck runs much better, its smoothens out! Can i wire a relay to leave them on as soon as i turn it off and shut it off when i dont use the truck?