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97 Ford E350 glow plug problems
We have a 97 Ford E-350 van with the 7.3 powerstroke. Recently I replaced all 8 glow plugs and the glow plug relay module. I connected a wire to the large stud on the relay module going to the glow plugs and ran the wire up under the dash board so I can watch a test light to make sure the glow plugs are lighting up. In the garage it has worked fine. We spent the night over in warm Leadville Colorado and the next morning went to start the beast and the glow plugs lit up 2 times when I was cycling the 'wait to start'. On my 3rd attempt the test light did not light up. Nor did the 4th try. The van was very hard to start. When it is very cold I normally cycle through the 'wait to start' at least 4 times with a 20 second ignition off between each.
Can someone tell me what the next step is to fix our hard starting problems?