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06-14-2015, 02:48 PM
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#1
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Junior Member
Join Date: Sep 2010
Posts: 20
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Left signal causes all lights to flash
All of a sudden the signals are not working in my 2005travel supreme coach. The right signal works fine and normal but as soon as I turn on the left signal all of the lights blink. This would be the rear centre brake light as well as the left and right turn signals as well as both left and right rear brake lights. This problem showed up when checking to see if everything was working after hooking up the tow car. I thought it was the car wiring but it is only on the coach as it does the same thing without the car being attached. I thought it may be the actual flasher unit and I may start there. If anyone has any other ideas please let me know
Thanks
Ron
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06-14-2015, 05:23 PM
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#2
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Registered User
Join Date: Dec 2013
Location: Norman, OK
Posts: 52
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Sounds like a ground wire problem to me. Check and make sure all the grounds are good. I would ground each light socket independently till I found the problem. Bad grounds cause all kinds of funky things to happen.
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06-14-2015, 05:28 PM
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#3
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Senior Member
Join Date: Jan 2014
Posts: 167
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Quote:
Originally Posted by rv9apilot
Sounds like a ground wire problem to me. Check and make sure all the grounds are good. I would ground each light socket independently till I found the problem. Bad grounds cause all kinds of funky things to happen.
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X2 and also check the bulbs for a broken filament.
__________________
Robert and Silvia
2015 Newmar Ventana 3436
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06-14-2015, 05:44 PM
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#4
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Senior Member
Join Date: Apr 2015
Location: Rogers, AR
Posts: 2,623
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X2 on the broken filament wire. If the turn signal filament wire just broke, not burned out, it can hang over on the tail light filament and feed power to the tail light circuit and cause all lights on the tail light circuit to flash.
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06-14-2015, 05:48 PM
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#5
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Aug 2014
Posts: 1,899
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Quote:
Originally Posted by alank
X2 on the broken filament wire. If the turn signal filament wire just broke, not burned out, it can hang over on the tail light filament and feed power to the tail light circuit and cause all lights on the tail light circuit to flash.
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Not common, but a possibility.
The way to check this is to run the test at night.
if you turn on the bad turn signal, the other lights will be dimmer. This indicates a bad ground. If the lights are normal brightness, then it us likely the bad filament.
Edited....this is not your problem since your center brake light is also coming on.
A broken filament could only short to the tail light filament......no way for it to cause the other turn signal to light up.
Dan
__________________
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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06-14-2015, 08:18 PM
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#6
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Senior Member
Join Date: Oct 2014
Location: Alberta
Posts: 598
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Could be the signal light switch.
2009 Safari Cheetah 40'
350 HP Cat
2014 Ford Focus
Air Force One
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06-14-2015, 08:40 PM
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#7
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,897
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Over 90% of all 12V problems can be traced back to a poor ground.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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06-15-2015, 09:30 AM
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#8
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Senior Member
Join Date: Jan 2007
Posts: 444
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Quote:
Originally Posted by Freestyle21
X2 and also check the bulbs for a broken filament.
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I was also thinking ground and then bad light bulb. I wouldn't even inspect it. Just go ahead and change it.
__________________
Scott - Pearl River, Louisiana
2022 Jayco Precept 34G, 2022 Ford Ranger toad
NSA ReadyBrake Elite tow bar
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06-15-2015, 12:50 PM
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#9
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Junior Member
Join Date: Jan 2011
Location: Rockwall, Texas
Posts: 16
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Had the same thing happen on my rig. Was sure it was a bad ground wire.
Spent some time running down the ground to find out it was just a bad bulb. Next time I will at least try a new bulb first.
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06-16-2015, 08:11 PM
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#10
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Aug 2014
Posts: 1,899
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OK....I have $1.73 that I am ready to bet on the fact that it is a ground problem
I can see a bad bulb where the filament breaks and shorts to the other filament in that bulb. Looking at a turn signal/brake filament, the only other thing it can short to would be the tail light filament.
Since the OP says that his center brake AND all other turn/brake lights turn on, it has to be a ground problem.
The simple test for this is turn on the left turn signal (bad one).
Locate the ground wire that is coming out of the back of the rear light assembly.
Using a jumper, provide an additional connection to a good solid ground.
Use a dental probe to pierce the insulation for the connection.
That should make things work...if not, try the same thing on the front signal.
If either of those two tests do not make it work, send me your address, and I will be sending a cashiers check......
Regards,
Dan
__________________
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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06-16-2015, 08:43 PM
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#11
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Senior Member
Freightliner Owners Club
Join Date: Apr 2002
Location: Pensacola
Posts: 2,728
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Had a similar problem, squirrels, (Tree rats) ate the wires behind the taillight. Definitely connects everything together...
__________________
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
2008 Suzuki Grand Vitara TOAD
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06-17-2015, 01:00 PM
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#12
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Senior Member
Join Date: Apr 2015
Location: Rogers, AR
Posts: 2,623
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The idea that a bad ground would make lights come on, that shouldn't come on just doesn't make any since in a vehicle.
If you had lights that wouldn't come on, that should come on, then a bad ground would be a reasonable explanation.
I'm still with the bad bulb w/broken filament, I've seen that happen.
I've never seen lights come on because they had a bad ground, even though an electrical circuit could be built to do just that.
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06-17-2015, 01:16 PM
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#13
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Senior Member
Join Date: Jun 2014
Posts: 356
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I have seen this happen because the solder terminal had actually melted on the bulb and fused the two circuits together(not as uncommon as you may think). I have also seen it when wires were touching in either the trailer plug or receptacle.
__________________
2015 A.C.E. 27.1
American Car Dolly
2001 Ram 1500 / 2012 Kia Soul....Go Hamsters!
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06-17-2015, 05:23 PM
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#14
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Junior Member
Join Date: Sep 2010
Posts: 20
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Problem is resolved. Yahoo.........
It turns out that the trailer light adapted had a brain Fart. Likely one of the diodes had a melt down and allowed the power to flow through from the signal light to the brake lights.
Thank you all for the suggestions. What a great group of fellow RV ers with an abundance of knowledge
Happy trails.......... Until the next crisis..... Lol
Ron
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