How Many Glow Plug Relays??? - Ford Powerstroke Diesel Forum
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Old 11-25-2011, 04:55 PM
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How Many Glow Plug Relays???

I've got a 2002 7.3 and I know I have a glow plug relay that has gone bad. However, there are two relays that look identical almost side by side. I know one is for glow plugs but what is the other one for? Is it a separate system or or there glow plug relays for each side of the block???
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Old 11-25-2011, 05:17 PM
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The other one is for your AIH (Air Inlet Heater) that is mounted in your intake spyder. Think of a heater element that glows red hot to help warm the air coming in the motor on cold start ups.
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Old 11-26-2011, 06:17 AM
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It's the shorter one in the back.

Also, the AIH has nothing to do with starting in the cold. In fact, your engine has to be running for a min or two for it to even activate (which it does RARELY anyway).
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