Question about 1999 Ford Expedition
Check the Wiring Harness down at your Starter. There was a NHTSA concern noted about corrosion on the wire ends. You might be able to get at least the Service Bulletin from the Dealer, run your Vin#.
Check your Starter Relay, its on the Firewall. The small wire is from the Keyswitch. You can unplug the small wire and jump the post with 12 volts. It will either crank with the jump or the Starter Relay is bad. Use jumper cables and bypass the Relay and see if the Starter is grounded out. It will arc like crazy, but if the starter does not turn over when you feed it directly, the wires or the Starter is bad..
If the Starter now cranks with the jump it means you are not getting fire to the Relay through the original small wire. The wire could have a bad connector or a break in that wire. However, the Antitheft system can also cut power to that relay. If you have another computerized Key for the Expedition, try it as your current key may be dead. Do not use another vehicles' key.
If another vehicles key was inserted into your Expedition, it can cause a wipe of the onboard Security Code. Remote starters can also disconnect the small wires' power. Try disconnecting the Ground Cable for 10 minutes and see if it resets.
Would like to know what defect you found.
Posted on Sep 29, 2010
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Posted on Jan 02, 2017
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