[FED 387]

Should have stated its a 2000 Turbo diesel ---already replaced the relay -helped when it was cooler out now that its cold won;t start without a small shot of ether -- runs smooth when it warms up -- starts well after it has been run and is warm and then restarted----replaced wiring harness UNDER the valve covers last year----there has to be an easy way to test the glow plugs WITHOUT going thru the hassle of dismantling the engine to do it---can you test thru the harness on top of the v cover and so what readings am I looking for that could narrow it down to maybe just one--- it I pull the v Covers to check it I am going to replace EVERY glow plug at that time not worth the time and effort to do just one plug---please keep those suggestions coming---FED 387