Help!! Turn signals and O/D button quit working

Jb1rd

Explorer
Went to drive the Beast (1994 E350 Airstream B190 with the 460 and E40D trans)to the car wash today and the Turn signal and O/D quit out of nowhere. They were working when I drove it back from Denver to Vail last week and this is the first time Ito drive it since. I checked the fuses that the manual state are for these items and they were all intact then I checked them all and they were fine too. I have a friend who is a mobile mechanic coming on Thursday but would like to see if anyone has any suggestions so I can save myself a bit of money or him some time if its above my pay grade:sombrero: TIA
 

flightcancled

Explorer
Unless the OD doesn't come on without detecting signals that would be a weird combo. Seems like it might be a wiring harness was damaged since the two wouldn't share a fuse.
 

Jb1rd

Explorer
Literally everything else is working, cruise control, running lights, head lights, hazards, brake lights, stereo, the only thing I did not try was the cig lighter as I don't have one and I didn't get my phone charger out of the other car.
I found this posted over on B190.com

generator dead, need help

Postby RobertS » Thu May 30, 2013 2:18 pm

1992 B19 with onan gen set.
Last week tuned carb and ran for 20 minutes to clear fuel line with ac running great. As for preventative maintenance I also replaced both the starter relay and auxiliary battery relays next to the radiator.
On the following trip to south Florida the gen set refused to start. Not even a click form the start or stop rocker switch inside or on the gen set. Checked the two 5 amp fuses on the start panel, they were good. Continued on trip.
Later in the day I noticed the van turn signals quit and the push button overdrive located on the shifter failed to work. After replacing the 15 amp fuse, under dash # 5 location about four times, the fuse would fail after five minutes, I located the problem. The auxiliary battery relay is on the same 15 amp fuse.
The brand new auxiliary battery relay failed, shorting out the fuse, leaving the relay open causing the house battery not to receive any charge while driving. Needing turn signals driving through Miami I unplugged the trigger wire connected to the new failed aux relay, replaced the 15 amp fuse #5 location and continued the trip using turn signals, back up lights, and over drive down shift, all on this fuse.

Back home replaced the failed relay, testing new vs the failed unit to confirm my diagnosis, but still no gen set. I have test light tested every fuse under dash, in the Ford van power distribution box, the 50amp aux fuse connector airstream mounts on the fire wall, the two fuses on the gen set, all fuses in the motor home panel under couch, they all test good. The gen set start/stop rocker switch makes no click sound, dead.

I just checked for voltage at the gen start/stop rocker switch in the MH and the two outer leads switch read .05 dc volts. I think they should have 14 volt each.

What about your running lights?
 
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Jb1rd

Explorer
**UPDATE

Mechanic came today and low and behold it was just a fuse, the odd part is that I took out every single fuse in the panel and visually inspected them, none were blown. He said he found it with his test light. Has anyone else had an experience like this. It seems so odd!!!
 

Mwilliamshs

Explorer
Visual tests only test what's visible. A fuse can burn in the molding part line if a blade fuse and be nigh invisible. The new smart fuses that light up when blown are brilliant but I bet there's already been a few that blew but didn't glow. Lots of multi-packs include very simple continuity testers.
 
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