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Old 10-20-2021, 10:30 AM   #1
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Brake and Blinker problem

I just bought a 2006 Tiffin Phaeton and have a couple of issues. First of all the left blinker doesn't work. It does not blink but the right side works fine. All the bulbs are good. Secondly...every time I step on the brake the left blinker also lights up solid. It also comes on with the Exhaust brake. The 4-ways don't work either they come on steady, no flash. The other issue I am having is with the running lights. When I turn on the headlights everything comes on normally but when I turn off the headlights the running lights stay on. I have to go outside and open the battery disconnect to the coach to get them to turn off. Once I close that disconnect again they stay off until the next time. I think there is a control module somewhere that ties all of these circuits together. I just don't know where it is. The chassis is a 2005 Freightliner. Any idea out there? Thx Jerry
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Old 10-20-2021, 07:49 PM   #2
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Welcome to iRV2.

Sorry your first post is about problems .

This appears to be a ground issue for the signal brake ( or a crossed filament in a bulb ) I'd be thinking the grounds in the left rear light sockets would be the place to start . Bad ground and cross fed will overload the flashers and stop them .
Marker lights I'm thinking a sticky relay .

Your exhaust brake activates the brake lights , when active , that's where the exhaust brake factors in.
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2000 Caravan toad, Remco & Blue Ox.
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Old 10-20-2021, 08:05 PM   #3
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Brake and Blinker problem

Skip,
Thanks for the info and thoughts about my first post here. I figured I could get some sound advise from someone and I did. The guy bought this coach from replaced both the front headlights with new ones. Maybe he crossed up something there but everything else works. I know bad grounds can be a problem too. Is there a module that has all the blinker and lights going through it on this coach? Thx.
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Old 10-20-2021, 08:25 PM   #4
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Your coach is new enough that Freightliner's free help line should still be giving out wiring diagram and schematic pdfs.
So give them a call with your chassis serial number .
Does your coach have a smart wheel ?
Switches for cruise and wipers, on the arms of the steering wheel ?

1-800-385-4357 1-800-FTL-HELP

The newest schematics I have are for a 2002 chassis and they are slightly different than my 99 so best to have schematics linked to your serial number .
Wiring changes, happen about as often as some people change their socks .

Both the 2002 and my 99 schematics show a marker light relay .
In a PDM ( Power Distribution Module)like these .

How custom are Freightliner Custom Chassis ? The numbers on the boxes in the first picture are the last of my serial number .Yellow circle , signal and hazard flashers.
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Old 10-20-2021, 11:50 PM   #5
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No mine does not have the smart wheel. I have called them but never got the schematics for my coach. I'll try again. Thx for the response.
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Old 10-21-2021, 11:05 AM   #6
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A second thought ; I always have them .

Late last night , I got to thinking about the brake lights illuminating the left signal indicator , and how a bad ground at the rear lights could cross feed brake light power ,to get to that lamp; and kept getting stumped .
Then I started considering other possibilities and , internal issues in the signal light switch came to mind .
I'm currently trying to figure out a test that would eliminate the signal switch as the problem , and will post when I have something .

One question , when the brake pedal is pushed and the left signal dash indicator is on , is the left front signal light also lit up ?
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Old 10-21-2021, 11:35 PM   #7
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Yes both front and rear are are on. Also the blinker light is a separate bulb from the brake.
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Old 10-22-2021, 11:19 AM   #8
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Quote:
Originally Posted by Jedoots View Post
Yes both front and rear are are on. Also the blinker light is a separate bulb from the brake.
Separate signal light on the rear of the coach , from the brake light .

Way different than my 99 that uses a common bulb AND opens up another possibility .

You probably have a trailer wiring adaptor , to take signals from the coach signals and brake lights and change to a common bulb set up on the trailer .
That adaptor module will have to be located , and disconnected to eliminate it as a possible cause of the power back feed.
Issues inside the trailer wiring connector can't be overlooked either .
But the turn indicator coming on is still giving me second thoughts.
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