New update.
A week ago took Expedition back to the shop that did the headliner. They were thorough, and spent about two hours. They dropped the front overhead center map console, both 2nd row overhead captain's chairs lights, the rear cargo light, as well as opened the C-pillar cover right rear side to expose the two cannon plugs. These things were all checked. They also removed the trim to the sunroof to look down the head of the top of the headliner. The only thing not done on this return trip was to completely drop the new headliner, and the board it is attached.
But, there seemed to be no apparent need to drop the headliner completely, as the wires that run along the top of the headliner aren't touched, just the connectors to the interior demand lights and front seat visor lights and two canon plugs. No apparent problem was noted.
So, a week later... That is this past Monday.....
I took it to my regular mechanic to have a look while scheduled for regular oil/filter change... and...
He found Fuse #24 blown. Fuse #24 as shown in the Owner's Manual and on whtbronco's Power Distribution Box visual above.
It is "hot at all times" and controls the "interior demand lamps - front map/dome lamps, 2nd row dome/map lamp, glove compartment lmap, cargo lamp, roof rail lamps, battery saver relay coil, battery saver relay power."
Fuses don't usually blow unless something causes them to blow...
... When he replaced with a good fuse, more weird things started to happen. The front overhead center console on/off switches begin to work, however the driver side overhead map bulb remained ever so slightly illuminated even when switched off, and both 2nd row overhead lights then remained on all the time, even with the doors closed! Clearly, the problem was not resolved.
... At that time, his thought was to try to replace the Headlamp Power Switch Assembly - which I believe is P/N SW3935. The shops manager put one on order from a local Autozone due to arrive Tuesday.
That was Monday at the close of business of his shop... and that's when things got more weird.
The next day, Tuesday, I got a call from the shop's manager that the vehicle was ready for pickup. I got over to the shop and while the shop did bring in a Duralast headlight switch the front manager said that the switch was missing two pins and could not be used on my vehicle and that a proper switch SW3935 will need to be ordered. The upfront manager said I could talk to the mechanic doing the work and the manager provided me a printed schematic with a brand new (good) 15 amp fuse taped to the spot on the schmeatic where it goes.
The mechanic hand wrote on the schematic that this good fuse taped to the schematic was "pulled out." This fuse is not in the power distrribution box at this time. The manager directed me to chat directly with the mechanic.
When I talked with the mechanic, the tune of the mechanic changed from the previous day. The mechanic shifted his position to believe that a new headlight switch probably would not solve the problem. When I mentioned to him that the upfront manager was going to bring in another headlight switch - proper one - without the two missing pins, the mechanic said that was news to him.
So the good news is that the "problem" is back to where it was as originally described in this thread, with the 15 amp interior demand lamps/battery saver relay fuse pulled.
The bad news is the problem is still not solved, and the mechanic appeared to shift his stance from Monday, where he thought it was the headlight switch, to Tuesday thinking less so that it was and just ready to get the vehicle out of the bay and on its way.
My view is that the blown fuse #24 provides a clue. I guess it is possible a wiring short is causing it, or, the headlight switch is causing the short.
Thanks for any new advice,
Todd
A week ago took Expedition back to the shop that did the headliner. They were thorough, and spent about two hours. They dropped the front overhead center map console, both 2nd row overhead captain's chairs lights, the rear cargo light, as well as opened the C-pillar cover right rear side to expose the two cannon plugs. These things were all checked. They also removed the trim to the sunroof to look down the head of the top of the headliner. The only thing not done on this return trip was to completely drop the new headliner, and the board it is attached.
But, there seemed to be no apparent need to drop the headliner completely, as the wires that run along the top of the headliner aren't touched, just the connectors to the interior demand lights and front seat visor lights and two canon plugs. No apparent problem was noted.
So, a week later... That is this past Monday.....
I took it to my regular mechanic to have a look while scheduled for regular oil/filter change... and...
He found Fuse #24 blown. Fuse #24 as shown in the Owner's Manual and on whtbronco's Power Distribution Box visual above.
It is "hot at all times" and controls the "interior demand lamps - front map/dome lamps, 2nd row dome/map lamp, glove compartment lmap, cargo lamp, roof rail lamps, battery saver relay coil, battery saver relay power."
Fuses don't usually blow unless something causes them to blow...
... When he replaced with a good fuse, more weird things started to happen. The front overhead center console on/off switches begin to work, however the driver side overhead map bulb remained ever so slightly illuminated even when switched off, and both 2nd row overhead lights then remained on all the time, even with the doors closed! Clearly, the problem was not resolved.
... At that time, his thought was to try to replace the Headlamp Power Switch Assembly - which I believe is P/N SW3935. The shops manager put one on order from a local Autozone due to arrive Tuesday.
That was Monday at the close of business of his shop... and that's when things got more weird.
The next day, Tuesday, I got a call from the shop's manager that the vehicle was ready for pickup. I got over to the shop and while the shop did bring in a Duralast headlight switch the front manager said that the switch was missing two pins and could not be used on my vehicle and that a proper switch SW3935 will need to be ordered. The upfront manager said I could talk to the mechanic doing the work and the manager provided me a printed schematic with a brand new (good) 15 amp fuse taped to the spot on the schmeatic where it goes.
The mechanic hand wrote on the schematic that this good fuse taped to the schematic was "pulled out." This fuse is not in the power distrribution box at this time. The manager directed me to chat directly with the mechanic.
When I talked with the mechanic, the tune of the mechanic changed from the previous day. The mechanic shifted his position to believe that a new headlight switch probably would not solve the problem. When I mentioned to him that the upfront manager was going to bring in another headlight switch - proper one - without the two missing pins, the mechanic said that was news to him.
So the good news is that the "problem" is back to where it was as originally described in this thread, with the 15 amp interior demand lamps/battery saver relay fuse pulled.
The bad news is the problem is still not solved, and the mechanic appeared to shift his stance from Monday, where he thought it was the headlight switch, to Tuesday thinking less so that it was and just ready to get the vehicle out of the bay and on its way.
My view is that the blown fuse #24 provides a clue. I guess it is possible a wiring short is causing it, or, the headlight switch is causing the short.
Thanks for any new advice,
Todd
