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Old 07-05-2017, 07:29 PM   #1
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Rear turn signals stop working when turning running lights on

2004 Holiday Rambler Scepter 40' When driving without lights being on all turn signals work. When I turn the lights on, the rear both right and left turn signals stop working. The mid and front work. The trailer plug works also. The turn signal that I switch to just lights up but don't flash.
Please Help. We are leaving on our rare Vacation on Saturday the 8th.
So this is a plea and a 911 for this issue!
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Old 07-05-2017, 10:17 PM   #2
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Sounds like you've got a poor ground problem .

Signal lights need a ground and there is some available when the other lights are off , a soon as the park lights are on , not a good enough ground for both.
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Old 07-08-2017, 06:19 AM   #3
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Originally Posted by DCDan View Post
2004 Holiday Rambler Scepter 40' When driving without lights being on all turn signals work. When I turn the lights on, the rear both right and left turn signals stop working. The mid and front work. The trailer plug works also. The turn signal that I switch to just lights up but don't flash.
Please Help. We are leaving on our rare Vacation on Saturday the 8th.
So this is a plea and a 911 for this issue!
Sounds like you have a corroded ground wire(s) on the turn signal lights. I'd take out all the bulbs and check the grounds with a meter.
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Old 07-16-2017, 07:35 PM   #4
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Thank you, I will check it out.
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Old 07-20-2017, 07:01 PM   #5
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Sounds like you've got a poor ground problem .

Signal lights need a ground and there is some available when the other lights are off , a soon as the park lights are on , not a good enough ground for both.
Actually what's happening is the turn signals are grounding through the running lights, but when the running lights are energized what appeared to be a ground becomes +12 volts. And the fix is to check the rear ground points!
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Old 07-31-2017, 02:54 PM   #6
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I set up a grounding wire, but that didnt work. I then wen5 to the front turn signal lights and removed the led bulbs and placed the original bulbs. And then the rear turn signal lights worked. Dont know why, they are on another Áircut. Also why are the bulbs needed with duel filiments? The plug calls for them. But only one is used. If they 2ere l8t up all the time. But they are in the yellow lenses.
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Old 08-02-2017, 02:09 PM   #7
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Thanks for helping me troubleshoot this issue
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Old 09-19-2017, 11:16 AM   #8
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Some locations on the Motorhome will switch the polarity of the power to the bulbs. I've seen this on clearance lights as well as running lights in the tail lights that will flash with the turn signal. This also is how the ICC function works in the running lights.

Solder in a bridge rectifier in the supply lines and that fixes the problem. The power of the LED is pretty easy to support.

Bend the output wires (marked + and -) 180 degrees and solder the socket wires to them with polarity to match the LED bulb.

Then connect the supply lines to the other two inputs. It doesn't matter which one connects to which.

Cover the exposed leads and solder area with heatshrink and then one large piece over the whole thing.

There is approximately 1V drop across the rectifier, but that has not been an issue for my LED's.

Ltvystore 2W10 DIP-4 2A 1000V Bridge Diode Rectifier for Arduino, Pack of 30

https://www.amazon.com/dp/B071X9GMBR..._X.uPzbR8F8998


Paul


Reposting from another thread.
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Old 09-21-2017, 04:41 PM   #9
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Iíve been fiddling around with LED bulbs on my 2001 Scepter but I havenít got it working correctly. Iíve found that the tail light bulb sockets behind the amber lens have constant +12VDC to the base. I think the bottom ones are the same but Iíd have to check again. An incandescent 1157 doesnít care about polarity so those bulbs work. You can confirm this with a test light. With the key on, clip the test light to ground then probe the socket base. i.e. not the contacts at the bottom.



Iíve not confirmed Paulís (pwittle) solution but I think it would work. You can read the whole thread here: http://www.irv2.com/forums/f115/leds...ml#post3776531

Glad you've got it working with the old bulbs so at least you can take your trip without that being a concern!
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Old 09-24-2017, 11:32 PM   #10
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Yep, swapped front turns for LED and when I had parking lights on, signals did not work.
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Old 10-04-2017, 02:02 PM   #11
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Interesting, I have the same problem, worked fine in the rear, or the front, but not both! I just left them in the rear and figured I would sort it out at another time.
good info!
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Old 12-19-2017, 03:38 PM   #12
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Could be the flasher unit. I would try an electronic one. These don't need as much load to flash. You have power to the light, its just not breaking the circuit. A flasher heats up and is supposed to open the circuit and then close the circuit. Where there is not enough load on the circuit ( due to led lights in the front) the flasher will not heat up and hence, it will not break open the circuit. So, just for fun try an electronic flasher.

The rear turn signal relays are fed from the 10 amp ignition fuse so the absence of the correct and original designed load in the front ( ie original bulbs) with affect the operation of the rear.
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