whosthedaddy07

Hi guys... Ive been having a starting problem first thing ( 2005 2.8crd ) for months now , had all the glow plugs replaced still the same problem but it starts fine for the rest of the day once started , Had a new powerful battery and still the same, so yesterday i decided to do a test got one of the old glow plug i new worked put it into number 1 glowplug wire rail then rested it on the engine turned the ignition on no preheat no glow , started the jeep and the glow plug glowed as it should for post heat and turned off after 15 seconds or so its like no power there or been drained from somewhere , repeated it a few times same result any ideas guys or tests i can do...... Many thanks in advance