Glow Plug Relay?? - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 01-03-2013, 05:29 PM Thread Starter
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Glow Plug Relay??

Tested my GPR today, I have the same volts out of my battery as I do on the constant on the GPR. When I turn the key, I get the same volts to the other big lug and only one of the small lugs. Now correct me if I'm wrong, but when you turn the key, it transfers power to the other big lug which then powers the two smaller lugs that send power to the GP. If this is the case, only one of my banks is getting power and that is probably the reason for a bunch of white smoke at start up and also a hard start/cold start at 21* this morning. I am waiting for my new GPR to arrive and I will be switching out GP, GPR, and injector Orings. Am I on the right track here? Thanks for your inputs. Being a first time diesel owner, I am learning most of my mechanics on diesels here and youtube.

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post #2 of 2 Old 01-03-2013, 07:51 PM
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Small terminals are for the coil part of the relay. The coil is energized when the PCM grounds one of the small terminals. When the coil is energized, the magnetic field produced moves the large contacts together which lets the big current from one large post go through to the glowplugs (connected to the other large post). Measure the voltage drop by placing the meter leads on the two large terminals when the relay is active. A reading of more than 0.3V and the relay is bad. Cheers!

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