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Old 03-05-2008, 11:51 AM
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Stupid Question Coming.....

I have a '99 F-350 with the 7.3L. Are there 2 Glow Plug Relays or only 1? Is a Glow Plug Relay the same as a Glow Plug Controller?
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Old 03-05-2008, 12:31 PM
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Old 03-05-2008, 12:35 PM
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I'm not sure on the SD's, but there should only be one relay. A glow plug controller is like th ones on old 7.3 IDI, that is a relay and has a circuit to control the length of time the glow plugs are on. In the newer trucks, the glow plugs are controlled by the PCM.
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Old 03-05-2008, 01:28 PM
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1 relay, no controller.
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Old 03-05-2008, 01:30 PM
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Pics

Here is a pic of the items in question. In the pic, left would be towards the cab and right is towards the front (grill). Are they both glow plug relays? If not, which one is, and what is the other one?
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  #6  
Old 03-05-2008, 01:46 PM
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The relay with the brown wire and the yellow wire on the same terminal is your glow plug relay. The other relay is the manifold air heater relay. Not sure which is on the left or right. I can't see the wires going to the relay.
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Old 03-05-2008, 01:51 PM
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Right if you look at the rear most relay thats the gpr. The other one is for the aih or air intake heater

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Old 03-05-2008, 01:55 PM
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I thought the other one was a starter relay?
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Old 03-05-2008, 01:57 PM
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No the starter relay is on the passenger side fenderwell
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Old 03-05-2008, 01:59 PM
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ooooo, you learn somethin new everyday!!
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