Glow plug relay??
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
When the relay is energized, you should have battery voltage on the GP side. If not, then your relay is robbing voltage somehow. If you have the AIH relay, then you can try swapping it out with the GP relay and see if your voltage readings are better. Here are some readings from my truck taken earlier this year...
Senior User
Joined: Sep 2008
Posts: 419
Likes: 0
From: Alfred NY and Long Island
Hey I am not trying to hijack this thread or anything, but my glow plug relay is shot in my truck, I picked up a new one, but I think it is slightly different then the old one. On the two little leads, there is an I and an S, on the new one they are in a different spot then they are on the old one. I will try and get some pictures of it tomorrow, and maybe I can finally get my glow plugs working again.
Dennis
Dennis
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Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
It could be the relay. Look at the pictures below. This one was cycling fine, but no voltage. When I tore it apart I found out why, yours could be similar to this and just creating too much resistance which drops the voltage.
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Freshman User
Joined: Mar 2011
Posts: 39
Likes: 0
94 white f250 sounds like you have a starter selinoid your year truck has a fender mount one that looks just like a gpr how much did you pay for it a gpr cost about 70-90 bucks and the starte selinoid coast 20-30 bucks hopes this helps i think this is the problem only cause it happened to me
Senior User
Joined: Mar 2007
Posts: 473
Likes: 3
From: Issaquah, WA
Rus, If you are measuring voltage "across" the relay, you should see something like 1V when it is energized. There should be 0V between the glow plug side of the relay and "ground" when not activated, and somethign near 11.5 volts to ground when energized.
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