Under valve cover harness - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 02-24-2014, 03:15 PM Thread Starter
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Under valve cover harness

2000 F250 160,000 miles

First off, I've been doing searches and there and many different scenarios and answers, so I'm starting my own thread.


I've got a hard cold start. If it's below 35* it absolutely won't start unless it's plugged in. The GPR tested good, so I tested the drivers side under valve cover harness. The #5 glow plug is bad, as it showed open, and I verified it by using a test light hooked up the the battery. My question is about the other 3 plugs on that side.

6-8 all read very high resistance (22-24 ohms), so would that mean the harness is bad, rather than having 4 bad glow plugs? I was about to test the passenger side, but got called to work and haven't been able to.

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post #2 of 4 Old 02-25-2014, 12:58 PM
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I would pull the valve cover and check to see if the UVCH has come unplugged partially. That would make more sense than an entire bank of GPs going bad

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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post #3 of 4 Old 02-25-2014, 01:30 PM Thread Starter
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Would it being unplugged cause high resistance?

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post #4 of 4 Old 02-25-2014, 03:19 PM
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It absolutely can

2005 F250 CCSB FX4 6.0
2003 Excursion 6.0 4WD
1997 F350 CCLB 4WD 7.3
1996 F250 SCLB 4WD 7.3
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