Question about 1999 Ford Expedition

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99 Expedition accessories stay on after the key is removed. This came to light today when I went to pick it up at the airport. The battery was dead and once I started it, the Theft light started blinking intermittently. I have replaced the accessory relay (#5) on the inside fuse block but the problem persists. Only removing the inside fuse block feed fuse from the power block under the hood turns the accessories off.

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Since you have located several components in your wiring you must be using a diagram. Look at your wiring diagram to see if the feed fuse has anything upstream that would cut off the power (like a relay or the ignition switch). If not, then the problem must be that the power from the feed fuse is not being turned off downstream. There must be another relay or the ignition switch is bad and keeping the power on.

If there is nothing listed you have a melted wire or connection which is bridging power to the accessories.

If your vehicle has a trailer plug, check the wires. Something is feeding power to a wire that normally is off.

Sometimes I disconnect the battery and check continuity on the wires. Off is suppose the be Off so that some wires are not suppose to be grounded to complete a circuit. Its a different way of looking at whether some wire is grounding. In simple terms if a pigtail is disconnected and the wiring is showing continuity there is a problem.

Posted on Jul 16, 2017


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Posted on Jan 02, 2017

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SOURCE: Fuse lables

fuse 27 under dash inside fuse panel, and it is a 10 amp

Posted on Jun 11, 2008

  • 2 Answers

SOURCE: accessory outlets do work.

Are you saying that the cargo compartment 12v outlet quit working? If so it has its own fuse.. its on the back side of the fuses you can access with the driver door open. you have to lay down in your floor boards and look up! hard to find, only like 4 fuses there.

Posted on Jun 07, 2009

  • 109 Answers

SOURCE: When I turn the key on in my 99 Expedition Guages go to maximum

probably when heater core replaced instrument cluster was damaged. check for broken wires or loose connections. on newer vehicles sometimes if you disconnect the instrument cluster you have to reprogram it with a scan tool for the car to recognize it.

Posted on Jun 24, 2009

  • 41 Answers

SOURCE: blown fuse for inside accessory outlet

Check your owners manual, this should tell you exactly where it is located.

Posted on Jul 12, 2009

Yuma Duner
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SOURCE: Intermittent fuel pump engagement when turning key - 2001 Taurus

try cleaning the connector that goes to the fuel pump, sometimes they corrode on inside. If that does not fix, test the wires feeding fuel pump with a multi meter until the condition shows itself again, if voltage drops to zero or very low then wiring problem, if voltage is unchanged with problem and fuel pump is not working and connectors are all clean, try replacement of fuel pump.

Posted on Oct 09, 2009

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