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E450 Passenger side tail light an turn not working backup is

Holiday27
Explorer
Explorer
Discovered it on our first outing of the season. I traced the wire to the gas tank. Test light showed it was still not working at that point. I lost the wires at the tank filler neck. Very frustrating. Any ideas where to look from there?

Thanks
2002 27PBS Holiday Rambler (Aluminum sided/roof) Love it!

Previous RV's
'94 Jamboree 22ft. (This beast had a 460 with tons of power)
'95 VW Eurovan camper (5 cyl. dog) Pulled a 3 rail fine though.
Tent:(
Borrowed folks '84 VW Westfalia (water cooled)
7 REPLIES 7

Holiday27
Explorer
Explorer
I've spent a couple of nights on this. Still struggling but I started thinking tonight that where I'm losing the wires is where it splices into the factory wiring harness. If I'm right I just need to figure out which factory wire is passenger side stop/turn. Tail light works! Any ideas on the factory wire I'm looking for?
2002 27PBS Holiday Rambler (Aluminum sided/roof) Love it!

Previous RV's
'94 Jamboree 22ft. (This beast had a 460 with tons of power)
'95 VW Eurovan camper (5 cyl. dog) Pulled a 3 rail fine though.
Tent:(
Borrowed folks '84 VW Westfalia (water cooled)

j-d
Explorer II
Explorer II
^^^ Sounds like it ^^^ Your flasher "thinks" there are burnt-out bulbs so it's showing you a fast-blink signal. It just doesn't know the difference between burnt-out and dis-connected.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB

Holiday27
Explorer
Explorer
Not getting power with prick light so doesn't that rule out ground?
2002 27PBS Holiday Rambler (Aluminum sided/roof) Love it!

Previous RV's
'94 Jamboree 22ft. (This beast had a 460 with tons of power)
'95 VW Eurovan camper (5 cyl. dog) Pulled a 3 rail fine though.
Tent:(
Borrowed folks '84 VW Westfalia (water cooled)

Holiday27
Explorer
Explorer
Back to front. I got stopped at the gas tank. No power to turn/ tail or running lights as checked with the prick light. Driver side works great though. I'm also getting a fast blinker on the dash and grill blinker when on to the right/pass side.
2002 27PBS Holiday Rambler (Aluminum sided/roof) Love it!

Previous RV's
'94 Jamboree 22ft. (This beast had a 460 with tons of power)
'95 VW Eurovan camper (5 cyl. dog) Pulled a 3 rail fine though.
Tent:(
Borrowed folks '84 VW Westfalia (water cooled)

j-d
Explorer II
Explorer II
Which way were you tracing, Rear to Front, or Front to Rear, when you lost track of the wiring at the gas tank?

Your chassis has been cut and stretched to provide the wheelbase needed for a large Class C. Wondering if the wiring connections have failed there.

Stop and Turn are directly related, from Brake Pedal and Turn Signal Switches to the rest of the coach. But Tail/Running is a separate circuit. They do, however, share GROUND. Do you have continuity from the Shell of the Bulb Socket, to the Chassis?

EDIT: Backup is another separate circuit, sharing Ground with everything else. That might mean Ground to the lamp assembly is good, but it's still possible for the shell of the Backup lamp to be good and the one for Stop/Turn/Tail to not be grounded.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB

Holiday27
Explorer
Explorer
I followed the wires with the ice pick last night. I got to the fuel tank and it was still not working. I lost the wires at the filler neck but it was getting dark and I was getting frustrated. I'll take another look at it tonight. Or maybe just let quad van fix it when I get my new front end put on. Hehe
2002 27PBS Holiday Rambler (Aluminum sided/roof) Love it!

Previous RV's
'94 Jamboree 22ft. (This beast had a 460 with tons of power)
'95 VW Eurovan camper (5 cyl. dog) Pulled a 3 rail fine though.
Tent:(
Borrowed folks '84 VW Westfalia (water cooled)

j-d
Explorer II
Explorer II
For the lights, have you pulled the lenses to inspect the Bulbs and Sockets? An "ice pick" test light is very helpful on testing like this. Better than a meter.

I got so tired of rear lamp problems that I replaced our original Bargman incandescent lights with Bargman LED versions. They have to be connected to the wiring supplying the originals. This eliminates socket problems as well as bulb problems. Direct replacement otherwise. Same screw holes. I changed screws to stainless just because I could.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB