I have some knowledge or cars . is this something i can do myself

Generic Electronic Module (GEM)-Generic Electronic/Central Timer (GEM/CTM) Removal
NOTE: The GEM must be reconfigured upon replacement. Refer to the scan tool help screen on the Ford Service Function (FSF) card to program tire size and axle ratio.

1. CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.Disconnect the battery ground cable. For additional information, refer to Section 414-01.

1. CAUTION: Use care when removing the instrument panel steering column cover (044F08) or damage to the cover locating tab may occur.Remove the instrument panel steering column cover.
   1. Unlock the retainers.
   1. Remove the instrument panel steering column cover.

1. Disconnect the bulkhead connectors from the instrument panel fuse junction panel.
   1. Loosen the bolts.
   1. Disconnect the bulkhead connectors.

1. Position the instrument panel fuse junction panel aside.
   1. Remove the nuts.
   1. Remove the bolts.

1. Remove the generic electronic module/central timer module (GEM/CTM).
   1. Disconnect the electrical connectors.
   1. Remove the screws.
   1. Remove the GEM/CTM.

1. To install, reverse the removal procedure.

I believe ford calls it a gem module.

In this model year Ford calls the BCM- Generic Electronic Module (GEM) It is located , Behind center of I/P !
Module - Generic Electronic (GEM)/Central Timer (CTM) Removal

1. CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result.
   Depower the supplemental restraint system (SRS). For additional information, refer to Section 501-20B .

1. Remove the audio unit. For additional information, refer to Section 415-01 .

1. Remove the center instrument panel finish panel.
   1. Remove the screws.
   1. Remove the center instrument panel finish panel.
   • Disconnect the electrical connectors.

Remove the GEM/CTM.

1. Remove the screw.

1. Disconnect the four connectors from the GEM/CTM.

1. Remove the GEM/CTM.

Installation

1. NOTE: When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 mi) or more to relearn the strategy.
   To install, reverse the removal procedure

on ford trucks the gem module is part of the fuse box .Go to junkyard and buy and have dealer program if cost is to high from dealer

I wouldn't try that sounds like you need a new switch could have bad contacts

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Fuse Box Diagrams https://fuse-box.info > ford > ford-excursion-2000-20...

In this article, you will find fuse box diagrams of Ford Excursion 2000, 2001, 2002, 2003, 2004 and 2005, get information about the location of the fuse panels ...

Ford Excursion (1999 - 2005) - fuse box diagram

Auto Genius https://www.autogenius.info > ford-excursion-1999-2...

Jul 2, 2018 - Ford Excursion (1999 - 2005) - fuse box diagram. Year of production: 1999, 2000, 2001, 2002, 2003, 2004, 2005 ...

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wath is gem module? i hawe no idea! Give me more details wath modul is it?

many things could affect it. there is an actuator on the transfer case. check to see that you have 12 volts to the big two prong connector when you select 2 or 4 wd. if you don't it could be the relays under the hood. they are called clockwise counter clockwise relays. it could also be the GEM/ 4x4 control module. in a 2000 it is mounted behind the fuse box, left side of dashboard. I just went throught his with mine. it was the GEM.

They are on the keyless entry module. Some are located near the inside fuse box under the steering column. Others are located in the rear kick -panel where the jack is.

For starters, do you have brake lamps? The shift lockout is controlled by the brake switch. As far as the others, yes it could be the GEM (generic electronic module) some of these vehicles have water intrusion problems that leat into the fusebox and GEM which is located on the back of the fuse box. If you can look at the fuse box inside the vehicle and if you can see the back, look for corrosion which is a sign of water.