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Old 06-05-2012, 06:10 AM   #15
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Running lights/any other lights flashing/blinking would indicate a grounding problem, usually right at the light?

I would be tempted to do as you mentioned earlier - start trying to isolate that RH turn signal. Would be nice if you could find it up near the steering column?
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Old 06-06-2012, 02:37 AM   #16
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Strongly suspect that the 'problem' is right at the light fixture, not in the steering column. That said, 'Ship Happens.'
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Old 06-06-2012, 08:42 AM   #17
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no, luck yet, still back by the rear fixture, does not make sense why the are lamps /brake / indicators blinkers work fine seperatly but not when combined. no grounding issues found yet.
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Old 06-06-2012, 08:55 PM   #18
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Install new or additional grounds to rear lights, did not fix the blinker / brake issue. next it will be at the column and blinker assembly. I would not think a bad flasher would cause this. left blinkers works fine and right flash fine until brakes are applied. just a though. dont know how it would get back to the brake circuit to cancel cruise control though? so i think we rule that out.
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Old 06-06-2012, 09:33 PM   #19
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You have.... A bad ground on the right rear tail/stop/turn light.

Possibly some other lights as well.

OR.. a bad turn signal switch.. I'd check grounds first.
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Old 06-07-2012, 02:42 AM   #20
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The cruise is cancelling when right turn signal is on is power is applied to the cold side of the brake lamp switch, this power tells the cruise module that brakes are applied and to stop cruise. The only places that are common with brake lights and turn indicators is the bulb or socket and the turn switch. A wiring problem may be there but because the left turn works this may not be the problem. Try stepping on the brakes and see if the front turn indicator comes on. this may tell if you have a defective turn switch. FL uses (at least mine) a turn switch that is common in 80s fords and are available at many auto parts stores for less than $20. My two cents worth....
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Old 06-08-2012, 10:45 PM   #21
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Brake lights, blinkers and cruise all working now.

Thanks for all that had responded with ideas. Found where someone had sliced the center brake light to the right blinker up in the fiberglass rear section of the bus, after removing splice everything worked great with the exception that i had only a 3rd/center brake light now. This was someone fix to the real problem. "hard to believe I know" Called Freightliner Support looking for a wiring diagram. Dewayne at Freightliner new just what the issue was. After explaining no brake lights he asked if the center/3rd lamp still lit. the answer being yes he explained it was a big issue years ago but they had came out with a solution. the wiring harness under the dash had a 6amp Diode for the brake lamp that failed under heavy trailer lighting loads leaving it without brake lights. The new fix was to install 2 - 6amp Diodes in parallel. " although not a recall they had been replacing it under warranty years ago but no more" he faxed me a 2 page repair instruction. The issue was finding the wire in 6' of 50+ wires in a loom that split off several ways. The wire at the column harness was numbered 1005d, hit the diode and then connected to 1005b. After an hour "and a very tired neck" of trying to split wireing harness from under the dash that had been rapped around the steering pedistal several times, "thanks Damond RV" I decided to find wire 1005B from the other end that was more open. Found it rather quickly and cut it from the loom. added a new wire over to the 1005D wire. Instead of connecting the diode inline I installed a fuse holder. soldered the 2 diodes together with a short pigtail on either end and a female spade connector. was not sure which way to install as diodes are direction but with the fuse holder if it did not work I could unplug and turn the diode around. worked first time. "should of bought some lottery tickets also". Added a couple of pics of the diodes and harness. Radio shack $2.90 for a 4 pack of 6amp diodes. Loading up in the morning gonna try it out. the pics shown are a spare. Tried to get repair parts from freightliner but was going to take 3-5 days. Oh, and it was $172.00 for the diode part. althought freightliner support was worth it. Bryan
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Old 06-09-2012, 05:49 AM   #22
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Awesome! Congratulations on having the fortitude to see your way through this!

It would be interesting to find a way to rub that shop's face in this....
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Old 06-09-2012, 09:43 AM   #23
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Thanks for the up-date BC. " ..... the wiring harness under the dash had a 6amp Diode for the brake lamp that failed under heavy trailer lighting loads leaving it without brake lights. The new fix was to install 2 - 6amp Diodes in parallel."

In my post above the word 'Diode' was the one I just couldn't come up with The diode allows 'power' to only go in one direction, no feed back into the electrical system. That said, when you put one of these into your system its imperative you have them 'pointed' in the right direction.

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