Question about 2002 Ford F350 Super Duty DRW Reg. Cab

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How do i test the glow plug relay on 2002 ford diesel

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Test by puting a volt meter to the glow plug top and earh and check for voltage

Posted on Oct 07, 2009

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Posted on Jan 02, 2017

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SOURCE: 1987 Ford f-250 6.9 liter

Check for fuses first. The Glowplug timer is the proper name for the part that responds to Temperature when starting your engine. When the engine is cold, of course it is on longer and can cycle making a click and intermittently dimming the lights on your truck. When the engine is warm, your gowplugs may not even fire as the engine is using compression alone to fire up.

Also, Ford did make a Severe Weather model that kept the glowplugs on longer. If you stay in Alaska or a climate with consistent subzero temperatures you may need it.

Posted on Nov 16, 2010

fastboyz
  • 674 Answers

SOURCE: 1995 ford 7.3 litre diesel glow plugs

the best way i have found to test glow plugs is to disconnect the wire to the plug and get you 12volt test light and put your negitive lead of the test light on the positive battery cable so when you touch the test light to any ground the light will light. so now go check your glow plugs and if you have one that doesnt light the light its burned out.
good luck

Posted on Oct 27, 2008

  • 1 Answer

SOURCE: 2000 GMC W3500 diesel (ISUZU NPR),cranks but no

fuel line pick-up broken in the fuel tank

Posted on Feb 14, 2011

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96 Ford F-350 Turbo Diesel. Replaced 4 glow plugs on driver side. After replacing the glow plugs and the glow plug relay, the truck will crank slow and not start. Batteries power drained quickly while...


Have a load test done on the batter to check for failing cells. For diesels to start any thing less than a fully charged battery good battery is a waste of time as the engine needs fast RPM to heat the air to ignite the fuel and slow rpm's just doesn't cut it.

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You would need to check the glow plug timer circuit and the fuel supply. Diesel glow plugs can wear out. Make sure the "Ready light" is working and that you hear the timer cycling. Usually the lights will dim as the power goes to the glow plugs.

The glow plug wire can be checked with a Voltmeter inserted on a wire from the Relay timer. The glow plugs are tested when they are removed from the engine. If you get this far, you can use battery cables to test them. They can melt. Ask for more details about proper procedure.

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Diesel fuel tends to be sluggish to pump in cold weather and that is why some diesel cars and trucks have heaters in the fuel tank to overcome this problem. However I tend to think that the glo-plugs are not working as they should be. Have them tested . The fuel pressure fault may be the inability of the pump to pump enough fuel to do the job.

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Glow plug for diesels


year model? Engine size? I need a little more information than ford won't start when cold. I would guess either the glow plug relay or the actual glow plugs themselves are bad, but usually the glow plug relay, because if it were just one or two glow plugs it would start, but run like ****.

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Have you checked the glow-plugs? On that system if one glow-plug is burnt up than it will not let the main relay in the controller to kick in.
Check all the glow-plugs make sure they are working.
The easiest way to check them is with a regular 12v test light.
Hook up the negitive end (aligator clip end ) to the battery + terminal and than with the other end of the test light ( pointed end ) touch each glow- plug connector tip ( with the glow-plugs harness connector removed ) and see if the test light lights up.
If the test light up--- glow-plug is good. If not than the glow-plug is bad--burnt out .

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does the glow plug/coil light flash at all???? once would indicate glow plug relay fault! three times would indicate FUEL pump failure! sorry never experienced two flashes....

Kind regards

Oct 20, 2009 | 2002 Ford SVT Focus

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Ford 2002 f250 7.3 diesel won't start on cold mornings just replaced the cold start relay and still won't start...what else could it be?


It probably is your glow plugs which are controlled by the cold start relay. They burn out over time. This is normal. Haynes Diesel Engine Repair Manual, part 10330, will walk you through the diagnosis and replacement easily. It's about $20. Hope this helps.

Oct 05, 2009 | 2002 Ford F250 Super Duty SuperCab

1 Answer

My ECM is not comunicating with my glow plug relay. I replaced ecm and still get no power to my glow plugs. I tried an ecm from another 02 F-350 PS and it works fine but the programs in the two ecm's are...


As I understand these systems the ECM is not what powers the glow plug relay. Any kind of engine controls happen after the engine starts.

There should be a power relay which feeds the juice to the glow plug relay. When you turn the keyswitch to start and the light for the glow plugs goes out you should hear a clicking as the glow plug timer cycles juice to the glow plugs.

The glow plug side is a separate system from the fuel management side. Someone should check the glow plugs to see if each is good. The diesel system used to be simple and it sounds like you are complicating what should be a simple repair. I could be wrong, but it does not sound like the Dealer is selling you the parts you need.

A diesel needs a heated combustion chamber to initially fire and then it runs by compression. Perhaps if you change the power relay from the vehicle you removed the ECM from and tried it in your truck it would work with your old ECM.

Jul 10, 2017 | 2002 Ford F350 Super Duty DRW Reg. Cab

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