Question about 1989 Ford F 250
460 engine no power to dash no power to electric fuel pumps no power to ignition. removed or dropped the steering column removed the switch that the key turns on when key is turned to start the truck but there is no power to that connection is there a bad relay? Truck was running just fine until I turned the truck off. when I was turning it off I seen sparks come out of the connections where the wires come to the part that has to bolts holding it to the steering column that is the one that when key is turned to start on-off can you help thank you the key is stuck in the ignition so I took this part off and used a screw driver start the truck worked fine until I get a new steering column now I this problem
No, not a relay. The ignition switch is too central to the electrical system. It sends power out to most circuits on the vehicle-those that are designated "hot in accessory, run, start" or some that are only "hot in run or start". Being central, it requires a direct battery source, a "hot at all times" source. Anytime the battery is hooked up, the yellow wire to the ignition switch is a hot wire (actually 2 yellow wires-they splice off before entering the switch or before entering the electrical connector for the switch). The source is Fusible Link M on the starter relay, one of many Fusible Links there, and tied in with the positive battery cable connection. So also, the alternator link is there, so is the headlight switch, the hazard and brake lights Fusible Link, and some others that do supply relays (fuel pump, eec relay, etc.). But Fuse Link M is dedicated to only the ignition switch. If you have no power at the connection to the switch, look at fuse link M. It should have some identifying legend or mark.
Where you saw the sparks, was it at the switch itself or the electrical connector to it? Either way you will have to check. If at the switch, It could be a bad switch, and may have also blew out the fusible link. If at the connector, check if it damaged the connector and is losing contact. Post back with what you find. Good luck.
Posted on Apr 18, 2014
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Posted on Jan 02, 2017
good old ford lol, try looking at the crank sensor its located at the front of the engine tucked in right hand side of exhaust manifold and gearbox, two pin plug, i have also known these to have no end of faults with the fusebox.
easy to remove, and solder the connections inside they all suffer eventually, if your not to handy with cars i recommend taking to a auto electrician, easy if you know how. Good luck Davelee
Posted on Mar 24, 2009
sounds like something in the housing where the tumbler rests. might want to try putting a use column in with the new tumbler. only an idea. they are a pain to rebuild.
Posted on Aug 12, 2009
on a lot of ford products there is a switch that goes from the fuel pump to the inside of one of the bedsides.
what this is, is a shock switch that turns the fuel pump off if it absorbs a hit.
its a really dumb safety feature but its effective.
there is a red button on it that u have to press to make it active again.
sometimes they just trip for no reason.
Posted on Jan 11, 2010
yes there are 2 relays under the hood on the driver side
one fuel pump in the tank and another on the rail under the drivers side near your foot. take off the fuel cap and put ur ear next to the fuel pipe inlet and listen while a assistant turns on the key,,, not engage the starter just turning on the truck. You should hear the pump. also listen under the hood for the clicks of the relays. the top cover of the relays will tell you which one is for the fuel pump.
also check the Inertia Fuel Cut-Off Switch (inside the cab by the drivers foot) is a relay of sorts. This little relay is in your car to save your life from fire by shutting off the fuel pump in the event of an accident. It cuts the power to the fuel pumps when a predetermined force is applied. Just like a circuit breaker the red button pops up when it is tripped. It consists of a steel ball held in place by a magnet. When a sharp impact occurs, the ball breaks loose from the magnet, rolls up and strikes a target which opens the electrical contacts of the switch and shuts off the electric fuel pump. It must be mounted straight up to work correctly. On some vehicles a fuel reset light will illuminate on the dash.
Posted on Feb 17, 2010
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