GP & Intake air heater relay??? - Ford Powerstroke Diesel Forum
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Old 12-26-2007, 09:49 AM
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GP & Intake air heater relay???

Hi im new to the sight and would apreciate any and all help and information. My glowplug relay quit working so I replaced it but when removing the old one I noticed that the large power wire to the GP was crispy from getting to hot and the bolt the wire ties to was also discolored from exsessive heat. I looked for anything out of the ordinary ie; loose bad or grounded wires that might have caused this, everything looked alright. So when I put the new relay on I also hooked up a multimeter on D.C., red wire to the output wire of the relay and the black to the batt. ground. I noticed that when the GP light on the dash went out the GP relay stayd on, I let it run for about 20sec after the light went out and decided to shut off the key to prevent any damage. I was wondering if this is normal or not and if so how long will the relay stay activated after the GP dash light goes out. I was also wondering if a person could use the intake air heater relay for the GP relay. My thinking is that the intake air heater relay would last longer than the GP relay. 2002, F-250, 4X4, CC, SB, 116,000miles, 6sp any help and information will be greatly appretiated.
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Old 12-26-2007, 09:57 AM
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The glow plugs stay energized after the wait to start light goes out. If you want to add an intake heater, I would make a new circuit for it, instead of using the GP relay.

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Old 12-26-2007, 11:37 AM
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Thank you for such a fast reply. I also own a 1993 7.3IDI and on that engine the glow plugs will burn out if they stay on for more than 30 seconds. thats why I was worried that on my 2002 7.3 DI the GP plugs are staying on for over 40 seconds. On the intake air heater my 2002 has one already from the factory and its relay is twice as tall as the GP relay, I was wondering if a person replaced the GP relay for the relay off the intake air heater. if it would last longer than the original GP relay.
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Old 12-26-2007, 12:28 PM
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The glow plugs can stay on for up to a minute or two after the light goes out, I can watch my battery gauge or head lights and tell when they turn off, usually about 1/4 mile from the house. I believe the intake heater relay is rated for less amps and would probably burn up. If I had one I would remove the heater and plug the hole, it does not help in cold starting and is only there to supposedly help reduce white smoke in cold weather.
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Old 12-26-2007, 03:02 PM
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Thank you so much for the info. I wish I would of registerd for this sit long ago when I had my first ford diesel 1985 6.9L
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