Question about 1998 Ford Expedition
Latifrashed, Look for an inline fuse coming off the alternator wires. Ford sometimes uses a 20 amp fuse located under a cover on the firewall marked engine main fuse. Check the fuse and if blown then this should solve your problem. If there are fusible links involved then these will have to be checked as well. Good luck with this.
Posted on Apr 11, 2011
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Posted on Jan 02, 2017
SOURCE: 2002 kia sedona van
There has been known issues with the alternator on several year/versions of this car. If memory serves me right, there was a TSB for the alternator either over or undercharging.The TSB (Technical Service Bulletin) specifies replacing the alternator and re-flashing the PCM.(Powertrain Control Mudule).
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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Posted on Jul 19, 2008
I don't know if your car has an integrated regulator or not; some house the regulator in a section of the alternator case, others mount it remote from it.
The regulator monitors the load and battery voltag,e primitively but effectively, and controls the current flowing through the field winding of the alternator to ground, changing the magnetic field intensity and consequently the voltage output of the alternator.
The 'hot' end of the field is internally connected to the + output, the 'cold' end is controlled by a transistor inside the regulator which, in turn, is controlled by circuitry monitoring the system voltage.
Some alternators can be tested by sticking a wire through a specified opening, actually shorting the controlled end of the field to ground briefly, while monitoring the voltage across the battery, doing this though for seconds only.
This essentially bypasses a suspected defective regulator; this causes the output voltage to rise instantly to its maximum of ~17 volts if the alternator is OK.
I don't recommend poking a wire at random into an available opening so having a service manual (Haynes-Chilton) would be nearly mandatory.
Posted on Oct 03, 2008
SOURCE: possible bad alternator?
I went through three alternators before we found a good one for our saturn sl2. Now she has been good for two years. All I did was go back to where we bought it from, they hooked up the alternator to a machine and gave us a new one when it read that it was faulty.
Posted on Apr 13, 2009
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