Join Date: May 2005
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Glow Plug Relay
Why does this happen? Over the last couple of years Iíve replaced 3 GPRís. Iíve noticed that on the new ones, both of the big posts are copper colored and shiny. As time goes by, one of the posts will fade and eventually tarnish &/or corrode. By the time the relay goes out, one post looks like itís a 100 years old and the other one is still pretty new looking. Also, the last 3 times the GPR went out it was b/c the ďtarnishedĒ post came out of the base. It kind of looks like it arcíd on the inside of the relay and the post blew out of the unit.
The parts store I go to happens to have some pretty knowledgeable guys. I asked why my GPRís are only lasting 10 Ė 12 months on average. He said it sounded like Iíve got a grounding problem and to check the glow plugs and the wire harnesses. I just said Ok and finished the transaction. I didnít tell him that all 4 wire harnesses and all 8 GPís are only a bout a year old.
Iíve always used the Motorcraft brand for GPís, GPRís, and wire harnesses. So I donít think quality is an issue, but maybe it is.
So my main question isÖ Why does one post on the GPR always degrade?
My other question isÖ.. Am I missing something? Should I look further into his idea of a grounding problem? What else needs to be grounded?
OR, is all this just typical of the Motorcraft relay?
Thanks for any light you can shed on this for me.