02 7.3 blowing relays - Ford Powerstroke Diesel Forum
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Old 11-14-2012, 03:49 AM
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02 7.3 blowing relays

Hey guys I'm new to the forum but had diesels for years. I'm having a problem with my 2002 7.3. I have gone through 4 fuel pump relays in the past week. When I turn my key over there is a clicking noise that comes from the box under the dash. My glow plug light stays on and truck will roll over but never start. Change the relay it works for about a day and then starts clicking again. Wondering if anyone can let me know what may be causing this relay to blow or if anyone has had this problem before. Thanks
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Old 11-14-2012, 06:07 AM
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In an '02, the Fuel Pump Relay is not replaceable (it's built-into the module)....

Exactly which relay are you changing?

What about it makes you think it's "blown"?
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Old 11-14-2012, 07:13 AM
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It's a small square relay under the dash left side of all the relays in the middle. It makes a continuous clicking noise when I remove that relay the clicking stops truck still won't start. When it's not working the glow plug light will stay on the truck will roll over but never start. I honestly don't know what is wrong I just know when I changed the relay the truck started and worked fine for a day or so then would do the same thing again.
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Old 11-14-2012, 12:30 PM
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That relays position has a number that you can look into your owners manual and find out exactly what it does. That will help in figuring this out.

Because it's an '02, Here's a Shot-in-the-Dark though and something to check out if it's the IDM relay (#303) -> POTENTIAL ELECTRICAL CORROSION if your truck is like mine......
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