2002 E450 chassis on our motorhome... Just noticed this weekend that all (5) cab clearance lights are dead? All other running/clearance lights are good and functional, and it appears all (5) bulbs are still good as well. I'm completely unfamiliar with how power is routed to these lights through the motorhome body, so I'm asking for any assistance or guidance on this? Could one single bulb being burnt out cause the entire run of (5) to quit, like old Christmas light strands? Or is there a separate fuse/relay for just those (5) fixtures that I'm not finding? I have checked every fuse I can find, and found the relay that operates the rest of the running/clearance lights and swapped it out for another with no luck... I appreciate ANY advice?! Thanks!!

 

what does the owners manual indicate? They should have their own fuse but not sure, raining today so cant get out to the coach to look at book. Do know my son had issues with his tow lights on an F150 and it has separate fuses for left and right side! If you dont have a book go to the ford.com site and type in the model and it will bring up the manual for you.

Look at these:

http://www.fordservicecontent.com/Fo.../02ecoog4e.pdf This shows a fuse for clearance lights as #7 in a fuse box?

http://www.carimanual.com/files/2002...x-diagram.html

 

More than likely, you lost the feed wire to the clearance lights from the power source, the feed wire can come from under the dash thru the bulk head, under the hood, and under the cab on the frame, and up thru the rear body. In the length of the wire, it could have been pitch, or broken off.

This front clearance light wire should be under the body, on the left side, just behind the B pillar of the cab.

You should have a brown or black wire feeding the marker lights.

It would be best if you can find the feed wire, under the body, just behind the cap, and make sure you have power to the wire with the marker lights on, and just feed a new wire up thru the body, to the front clearance lights.

I had to do the same thing on a cube van, but of course, the van body was not totally finished off inside, just plywood on the inside walls.

Being a RV, the front markers could also be feed from the rear marker lights, with a wire running from the rear to the front, with-in the body.

Also, Most clearance lights are grounded from the light housing to the body, but I have seen cube vans with a separate ground wire from the light housing to the metal of the body. I mention this, cause if you have power from the feed wire up at the light, then the ground wire could be bad.

I don't think the site would help you any more that what color the wire for the marker/parking lights would be. You have an RV, which is consider to be a "cut-away" body.

What you wrote about one bulb burning out and the rest don't light, is not the case, that's "wired-in-series" and not done on vehicles. The lights are "run-in-parallel" each light has a feed and ground wire.

 

Good info, thanks! I will hopefully have some time to tear into it this weekend and see what I can find. I had another guy also mention the front lights may be fed from the rear lights, running through a chase or cavity in the roof... if I have to, I can drop all of the vents and fixtures in the roof and look for any wiring runs and go from there?