Question about Ford F250

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Starting issue, I have a 1993 ford f250 7.3l pre powerstroke. I started the motor and it stalled out like there was a short, now when i turn the key my glow plugs do not fire and wait to start doesnt show up. I replaced the glow plug relay and still have no start. any ideas on where my short could be? I have no idea where to look for anymore shorts.

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  • Ford Master
  • 5,537 Answers

On some Models the glow plug Relay does not have an integrated Power Relay. This means there is a second Relay before the glow plug Relay that feeds it power.

You should check the wires running to the glow plug Relay for power with the key ON. Check some other wires off of the Ignition switch to make sure your 20 year old Ignition switch is good.

There are some sites which show vehicle wiring. Autozone has a free section after Registering your vehicle but it takes a little sorting through the Help section. There should be a fuse to protect the above Relays.

Make sure you find the Diesel-equipped wiring circuit. Diesel ignitions are different from gas units.

Posted on Dec 27, 2013

Testimonial: "Would that cause the truck not to run at all? I can turn it over as well but it wont fire"

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Posted on Jan 02, 2017

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SOURCE: How do you change the glow plugs and relay in a F350 1997

Hello, here is the proceedure. Any questions please ask. Good luck. CAUTION The red-striped wires on the 1994-96 DI Turbo engine carry 115 volts DC. A severe electrical shock may be given. Do not pierce the wires.

  1. Make sure the ignition switch is OFF.
  2. For 1994-96 engines, remove the valve cover.
  3. Disconnect the wire connector from the glow plug.
  4. Using a 10mm deep socket, with enough clearance as to not break or bend the wiring connector, unscrew the glow plug from the manifold.
To install:
  1. Place anti-seize on the threads of the glow plug and screw it into the manifold.
  2. Tighten the glow plug to 12 ft. lbs. (16 Nm).
  3. Plug the wiring connector.
  4. Connect the negative battery cable.
  5. For 1994-96 engines, install the valve cover.
0900c152801cd773.jpgFig. 4: Disconnect the wire, then remove the glow plugs as shown

Posted on Jan 23, 2009

  • 2 Answers

SOURCE: Problem with cold starting Ford 7.3L Diesel at > freezing temps

most likely the relay. its located to the left of the fuel filter( looking at the motor from the front). my experience is that they only last about 50,000 miles. the part costs about $20 at an navistar dealer. remove the cowl over the filter, disconnect the batteries(so you don't short the new relay out if you cross the polarity with a wrench) ,remove the four wires from the ceramic relay, un-fasten the relay from the base. reverse the process with the new relay. CAUTION; do not over-tighten the nuts on the wire studs, you could crack the ceramic relay.(iv'e done it) . hope this helps

Posted on Mar 18, 2009

  • 1 Answer

SOURCE: 97 7.3L powerstroke wont start?

Checking and cleaning the battery and conections at the battery and starrter not forgetting the all impotant grounds is a must at first. slow cranking do to bad battery's or conections is a common cause witch will allso decrease the effectiveness of the glow plugs. Allso the glow plugs of this truck do have a problem of going out so a new set wouldn't hurt the other thing to know about this truck is that the light indecater is just a recomendation the plugs themselves will stay on for around two minutes so a delaid start ten to twenty seconds prior couldn't hurt and will help the enitial cold start. Other known hard start problems for this rig consist of worn fuel pump, bad glow plug relay, or high oil presure sender. I allso would refrain from using either by pluging the truck in tell you can find the problem.

Posted on May 23, 2009

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