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Re: 1994F-150 will not start
There is a fusible link, in the wire from the battery to the starter. possibly it is melted out, the wire replaces the link
possibly the starter switch has a dud connection, so when you turn to start there is no current
not a guarantee, something to check
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You may be having problems with the Starter Relay. There is a small wire on the Relay which runs back to the Ignition switch. If you put a testlight on the end of this wire and turn the Ignition key to START, there should be a steady current going to this small wire. If the testlight cuts out, the Ignition switch is bad. If the testlight works every time, then most likely the Starter relay is bad.
Or you can just change the Starter Relay and forget testing the small wire. You might want to go to Autozone, Oreillys or Advance for a starter Draw test of the new starter after you replace the Relay. Then have them do a test for the Battery to see if it is shorting under a load.
Try bypassing the Starter Relay. You can use a tool to jump across the terminals, but if you have a jumper cable just go from the battery side of the switch to the starter side.
There will be sparks, and the tool or cable will heat up, but if the Starter does not turn with normal speed; the Starter is bad or the main cable connection on the starter is corroded under the vehicle.
If the Starter does turn with normal speed, get a test light or Voltmeter and take off the small wire on the Relay post. Its usually in the middle of the Relay. Connect 1 end of your test equipment to a ground and the other to the small wire. Then turn the Ignition Key to Start. The test equipment should show power in the small wire.
If you have power in the small wire, then the Starter Relay is bad. The Relay is not connecting the power to the Starter. Replace the Relay.
You should be fixed by now. If you are not getting power to the small wire, you need to inspect the Interlock switch under the dash by the Brake pedal lever. There are 2 safety modes in your vehicle. The Interlock stops the starter from working if you are not in Park or Neutral. The switch is often hit by feet or gets out of adjustment through use. Adjust or replace the Interlock switch.
I hope my solution was very helpful in getting your vehicle running.
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.
to check if you can try hitting the starter, with a hammer or bar. if it starts, it's the starter for sure. you can also jump the posts on the starter, the small one to the big one, if it starts and the starter sounds normal you will have to check the small wire/ignition wire and switch. if *** justs clicks or does nothing it's the starter. let me know
2 problems, first you have bad starter or starter relay for starter staying engaged, keep alt plugged in has nothing to do with starter staying engauged, to test starter relay, jump at relay bat + post with red/bk wire on solonoid, if cranks over without staying engaged, then not relay or starter but rather in your ign switch, ford had bad problems with ign switch some years ago doing that
Appears to be a cranking isuue. Ford uses a starter relay an normally mounte under hood on left fender.. Battery + cable will ytake yo to it. Nake sure vehicle is in park or neutral. The relay has two large posts. momentarily jump the two and see if it cranks. If it does, Momentarily jump the post from the battery to the small post that has a push on wire connectorr. SShould crank that small wire is the one energize when you turn the key. Ck the wire for current if t he engine cranks in bith of your jumo tests. Good Luck -Ned
Try jumping the solenoid,pull the actuator wire off the solenoid(the small one)This will engage the starter so make sure your in nuetral or park,run a wire from the solenoid actuator to the positive battery post,if the starter engages your ignition switch or starter relay have become faulty,if the starter does'nt engage the solenoid has gone bad.Post back if you need more help.
if by bypass you mean the ignition switch. jump it at the relay, find the starter relay the relay should have a diagram on the side and numbered posts on the bottom with a jumper wire you can jump the post in the power distribution. look at the diagram there should be a switch which shows normally open you need to jump the posts that would close this switch and this will jump you starter make sure you key is on to start the vehicle. hope this helps some