Land Rover Defender - land rover wont start, but will bump - a3ryo

i have a G reg land rover defender, it turns over fine but wont start off the key. when i bump start it, it fires up straight away. the glow plug light comes on with ignition then goes out as it should and i have changed the plugs.

Land Rover Defender - land rover wont start, but will bump - Peter.N.

I would say the problem is most likely no power to the glow plugs, connect a meter between any glow plug terminal and earth, turn the ignition to the glow plug position and check for voltage, you should have around 11 volts for about 15-20 seconds, if you don't the relay is probably at fault.