Question about 2001 Ford F350 Super Duty SuperCab

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Ford Diesel glow plug relay goes out every year since 1993

The Ford dealer ship says there is no problem. It just happens, but it cost anywhere from $250 to $480 a year to replace the relay with a new one. They say the glow plugs are fine. It doesn,t matter if it is cold or warm out. The truck is garaged every night and the temp in the garage doesn't get below 38 degrees. My truck is a F350 Super Duty, I believe the diesel is a 7.3 Turbo power stroke with 72,000 miles.

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  • trophymag Jan 05, 2009

    I do appreciate the help. In the future I will change the relay myself. The truck is a 2001, F350 with a 7.3 Power Stroke Diesel. I took it to a mechanic that specializes in eletrical problems. He doesn't work on diesels. He found that the oil was low and this prevented the diesel from getting fuel. A safety factor for the engine. What I was looking for was a reason why the relay goes out every year. The tow truck driver that picked up my truck said that it happens frequently on Ford trucks.

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The relay should cost about $35-45. A common Ford Starter relay can be used in place of the official glow plug relay. All that is required is a relay with terminals that have 5/16 or 3/8 terminals and can carry about 150-200 amps. When all 8 glow plugs turn on, it draws about 150 amps is all. There are two relays for the 7.3 diesel. One energizes the glow plugs and the other energizes a heating element in the air intake. That one is used to help eliminate white smoke while warming up and is turned on and off by the engine computer. It is usually only called for when the temperature is 20 degrees F or lower.
Otherwise only the glow plug relay works.

Posted on Feb 13, 2013

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Wow that sounds expensive for a relay. You didnt say what year it is and you thought it was a 7.3 powerstroke. Sounds like its a 6.0 powerstroke I could see that relay costing that many bones. If its a 7.3 liter you should be able to buy one them glow plug relays yourself and with a basic set of sockets change it yourself. You just need to unhook both ground wires on the batterys before you start. Should take like 30 mins max on a 7.3 liter. But a year and engine size would make it easier to help you.

Posted on Dec 30, 2008

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