ON A 2008 E250, WHERE IS THE DOME LIGHT WIRE AND WHAT COLOR IS IT ?

TO USE WITH AN OMEGA SECURITY SYSTEM.

 

Here's a diagram for Autozone's site.
| Repair Guides | Interior Lamps (2008) | Interior Lamps (2008) | AutoZone.com

I am not sure what you need. The door switches go into the computer, and the computer takes this info and activates the interior lights relay in Aux relay box #2.

 

Pinpoint Test D: The Courtesy Lamps Do Not Turn On With One Door Open
Refer to Wiring Diagrams Cell 89, Interior Lamps for schematic and connector information.
Normal Operation

The instrument cluster (IC) monitors the door ajar switch status on circuits 159 (RD/PK), 1034 (BK/WH) and 628 (WH). The door ajar switches supply a ground through the switch contacts to circuit 57 (BK). When the IC detects a door ajar input, the IC then energizes both the battery saver relay and interior lamp relay. When the relays are energized, voltage is supplied to circuit 53 (BK/LB) for the interior lamps.

THE CIRCUIT 53 (BK/LB) IS IN THE HARNESS NEXT TO MY LEFT DRIVER'S FOOT RUNS ACROSS THE FOOT WELL THEN UP THE SIDE TO THE DOME LIGHT ?

 

Here's the harness diagram from Autozone's site.
AutoZone.com Repair Guide Image Harness Overview, Page 01 (2008)

Here's the legend for the above diagram.

AutoZone.com Repair Guide Image Harness Overview, Page 02 (2008)

I believe harness 16 is the interior lights.

 

HOLY MOLY diagrams are Ford's I tried copying for $16 in a marathon session ....but the diagrams didn't copy. I am in for filters fersure !
The suggested location is Crutch's location for Omega alarms BUT ! the wire is wrong color AND I haven't measured the correct off/on voltages there.

But with AutoZ, again I'll try. What I wound up with was 85% operation with wrong suggested wire locations and colors...maybe diodes are necessary for example door switches without dome light connection are a black -18 Ford gauge wire...left with EXTRA LENGTH...inside an access hole front right door. Grate ! works front doors but not side and rear. Crutch doesn't mention this.

Thnaks that is very good information - tops ! - AAA.

tell the door switch poster I cannot refind that there's a door panel screw under the door HANDLE panel.