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Old 05-22-2008, 04:36 PM   #15
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OK, I think I remembered what was going on with my buddy's car. Somebody had replaced his tail lights with single element bulbs when they should have used double element bulbs. The double element bulbs have two contacts on the bottom of the bulb. Single element bulbs have only one contact. The single element bulb was making contact with both of the contacts in the bulb housing on the car and causing a short. Whenever he hit one turn signal (left or right), both would flash.

Axel, you said you put new LED lights on the Airstream? When did you do this (before or after you bought the 'Burb) and how exactly are they wired? That may the problem. They may be wired wrong somehow. Whenever I have electrical problems, I always look at the last thing I worked on (and only try to change one thing at a time, make sure it works, then move on to the next thing).

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Old 05-22-2008, 04:48 PM   #16
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we're on the same page. i'm thinking that the park lamp and brake lamp is shorted. it could be that the high and low side pins have been reversed. with that lamp removed, i suspect that all the lamps will not flash when the left signal is turned on.

if that does it, carefully examine the bulb and wires, including the ground.
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Old 05-23-2008, 01:14 PM   #17
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Axel, you said you put new LED lights on the Airstream? When did you do this (before or after you bought the 'Burb) and how exactly are they wired? That may the problem. They may be wired wrong somehow. Whenever I have electrical problems, I always look at the last thing I worked on (and only try to change one thing at a time, make sure it works, then move on to the next thing).

Jim[/QUOTE]

i was waiting for my new ( to me ) car when i was replacing the taillights.
When i use a wire to put 12 volt on the lights ( at the trailer connector), i can make 'em light up one by one. ( left and right ) and when i hit the brakes, they both light up..
That makes me feel like its wrong in the car..
i just think i replaced the wrong part.

please correct me when i am wrong.

Axel
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Old 05-23-2008, 04:43 PM   #18
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power up the trailer left turn signal as mentioned above by putting power to the one lead. then take a volt meter and see if there is voltage at the brake lead. you can also do a continuity test across the brake and left signal connections.

there should not be voltage at the brake line when the signal is powered and there should not be continuity between the brake and left signal terminals.
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Old 06-01-2008, 12:57 PM   #19
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how are you making out?
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Old 06-01-2008, 02:27 PM   #20
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Quote:
Originally Posted by richinny
how are you making out?
i wish i could say i fixed the problem..
i have been working somewhat more then usual lately , and then wife and kids needed attention as well. i will have to travel this week, so i din;t get a chance to look at it again.

as soon as i find out what is wrong i will let you know !

Axel
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Old 06-01-2008, 04:09 PM   #21
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With the trailer disconnected from the truck test for voltage while the left turn signal is on at the 7 pin connector at 9 oclock. You should see voltage. Now while the left turn signal is still on test for voltage at 3 oclock. If you have voltage at 3 oclock, on the right turn signal connector, while the left turn signal is on your problem is in the truck.

I would try and find a friend that would let you put your 2 modules in his truck and see if the problem follows you there. You may have 2 bad modules.
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Old 06-01-2008, 04:22 PM   #22
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Quote:
Originally Posted by HowieE

I would try and find a friend that would let you put your 2 modules in his truck and see if the problem follows you there. You may have 2 bad modules.
thank you for your advice, HowieE

i will do the volt meter test again, but the exchange test will be hard since these vehicles are not to common here,
i doubt if there are more then 2 or 3 recent ( later then 2000 ) suburbans in holland, and they most probably converted them to european lights for trailers.. ( separate break and turn-signals )

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Old 06-01-2008, 06:03 PM   #23
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isn't there some kind of special wiring required to use the european style TV lights and the US type trailer light so they don't backfeed?
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Old 07-31-2008, 01:30 PM   #24
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problem solved !? ( or located)

thank you all for your support and suggestions !

i replaced the junction box, and almost every related fuse.. no luck.
i checked all the electric diagrams at ALLDATAdiy.com :: Leading Source of Diagnostic and Repair Information

Then i discovered that when i remotely lock the truck, the front signals flash, and the rear brake lights.. and that , if i leave the turn signal on for more then one minute the problem disappears.

someone installed a 3rd party alarm, and didn't do a very good job.. i can remove the problem by squeezing in the cables below the steering column , i guess something is shorted in there..
By the time i found this out, it was dark again, so i will try and find the short today after work.

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Old 09-17-2008, 01:30 PM   #25
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getting closer ....

looking on the web for a new flasher module ( i am replacing everything electrical ) i found this :

"I had a problem with the signal lights on the trailer that nearly drove me crazy but is now resolved. I thought I would share the solution with the forum to avoid any more crazy RVers.

When I would engage the left turn signal both trailer lights would flash. Deploy the brakes and the left light would go out completely unless you weren't signalling a turn in which case only the left brake light would light. The right signal worked fine. To make matters worse, the problem was intermittent but, as time passed became pervasive.

I will send a separate post to go over all the things I did to diagnose the problem but eventually narrowed the problem down to the truck, not the trailer.

My GM dealer finally determined the problem to be the hazard/turn signal module. The part number, for my truck and most others in the Sierra/Silverado line is 15764135 - Flasher 025750.
"

source :
RV.Net Open Roads Forum: Towing: GM & Trailer signal light problem

this seems the same identical problem i have

now looking for the right module in europe.
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Old 09-17-2008, 04:28 PM   #26
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Hi AxelBruijinis; Do Not Forget, you are working with DC current. If the ground to the left turn signal is weak or bad DC current will back flow via another grounded positive wire [bulb]. Remove left lens, get a long enough jumper wire and ground the left turn socket. If the problem disappears you have grounding problem on that side. Thanks, "Boatdoc"
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