Question about 1998 Ford Expedition

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What to look for? why is this electrical system malfuntioning?

1998 expedition drove vehicle 4 miles to work headlights on ran fine stopped at stop sign vehicle died assumed bad gas cause i just topped off .let vehicle set 3 hrs fired right up however brake light and abs light in dash flash .abs brake light go out when pressure is applied to brake pedal but return as brake pedal is released. in addition while ignition key is on headlamps off they illuminate but dim.if ignition key off headlights off headlights dont light .also when key is on or off when headlamps are turned on passanger headlight is way brighter than driver side.the worst part driving this vehicle headlamps off runs fine switch parking lamps on runs fine turn headlights on vehicle will die as if your shutting they key off switch headlamps back to parking lamp setting or off position vehicle will regain power and run stong . what is causing this electrical problem?

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Ok.........sounds like alternator getting ready to die altogether. go to autozone and have them check for free. your alternator is carrying such a heavy load that it cant keep up with all the electrical components. thus most of the time your truck electrical system is being run directly through your battery. pretty soon you wont be able to start truck at all because your battery depends on the alternator to charge it.

Posted on Apr 03, 2015

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Car electronics systems are opposite to normal electronics.
Bad ground connections, blown fuses and even burned out bulbs, can cause some very strange looking problems that don't apply to normal electronics troubleshooters.
Cars put plus voltage to all devices, then look for a ground to complete the circuit. This causes strange events to happen. Things that even the manufacturers haven't seen yet.

Electronics systems all have a stable ground system and then applies Plus voltage to activate the circuits. There are no strange things happening here.

So look for bad grounds, blown fuses and burned out bulbs and all should be ok.

Just a thought.

Posted on Apr 02, 2015

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Well that kind of sounds like a bad connection, but it was difficult understanding with no good punctuation... Have you checked the battery terminals? If not, do so, and have your alternator checked too. I've seen some really goofy stuff happen when some vehicles don't get enough power.

Posted on Nov 23, 2014

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2 Answers

How to find an electrical disturbance in 1998 ford expedition

Normally this condition is the result of a poor body ground connection. Testing for this can be deceiving. At the static(nothing on) condition, testing can show a good ground. However when a circuit is excited, it has a determined resistance and a set current flow. If the ground connection to this or a branch circuit is loose, corroded, or broken wire. This will allow just enough connection to show as being good, but not good enough to complete the circuit with the required amount of connection when energized.

Nov 30, 2014 | 1998 Ford Expedition

1 Answer

How to pinpoint and fix electrical disturbance in 1998 expedition?

Could be the ignition switch itself. Under the hood where all the wires go into the fusebox in the cab is a good pkace to start. You need to take the bolt/nut off and pull the box and wires apart. I have seen fuse blocks heavily corroded and cause problems as you are haveing. Also could be the ecm (aka)computer in your car is going bad. You can get a remanufactured one cheap. And it is simple and strait forward

Nov 23, 2014 | 1998 Ford Expedition

1 Answer

1998 expedition yesturday was low on fuel got gas drove with headlights on got 4 miles down road vehicle died thought was bad gas 3hrs later vehicle would run but abs light and brake light would flash

There is a problem in the electrics of the vehicle. First place to start is to check the alternator drive belt for condition and tension. Next place is the battery terminals and condition and tension . Third place is to have a load test done on the battery as it may have an internal short and drawing all the current from the alternator. In effect when you add power requirements ( park lights then brake lights then headlights) you are actually using more current than the alternator can supply to keep the engine system running.

Nov 22, 2014 | 1998 Ford Expedition

1 Answer

Car started fine drove 1 mile interior lights, gauge lights, and raido stopped working. Also the headlights dimmed almost off. The van will not start now.

does the car turn over still?? if not id say you need to replace the alternator and the battery, that will take care of your prob... but if it still turns over your problem is something totally different.. need clarification if vehicle still turns over.. hope this helps

Dec 08, 2010 | 2005 Ford Freestar

1 Answer

Vehicle sounds like it is missing out and has a horrible sound and check engine light is flashing

I had the same problem and I ran the truck down towards empty. Upon filling the tank with fresh high octane gas I drove my truck for 50 miles on the interstate. After that drive my 2006 f150 with a 5.4 ran like new again

Jan 01, 2010 | 1998 Ford Expedition

1 Answer

Loss of power can only go up to 20 mph

Check for plugged exhaust system. Probably is catalytic converter.

Apr 15, 2009 | 1998 Pontiac Sunfire

1 Answer


after another check,determined it was bad alternator

Jul 08, 2008 | 1998 Ford Windstar

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