hi its ryan

[ryan 79]

being new to this i have put a new engine in my fiesta i have tryed to start it but i have dash lights and when i try to start it there is nothing but the main beam blue light stay on what can it be any sergestion would be help full thanks

[MG CHRIS]

Earth cable not on without it it will not start

[FraserLFA]

ryan 79 said:

any sergestion would be help full

Use punctuation and spelling

Welcome to PH...

[williamp]

could be lots of things. Of the top of my head (andf starting with the easiest to check)

-battery gone flat in the time its taken you to swap the engine. There might be enough for lights, stereo etc but not enough to even turn the engine. Check with multimeter
-cables to the engine from the battery
-earth cable as mentioned above
-is the engine moving at all? Then check starter motor. You'll probably need to remove it onto a bench and test with a battery. Carefully...
If it turns nice and fast but no start, then its either fuel or ignition. Check ignition as that's more liekly to be a problem. Fuel is more straightforward

Finally, if its a modern: immobiliser??