Marker lights on - Page 3 - Fiberglass RV


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Old 10-22-2012, 12:00 PM   #29
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Quote:
Originally Posted by Darwin Maring View Post
Raz, The Scamp electric brakes use the frame as the negative path. Do you have electric brakes?
Darwin as you suggest Scamp does use the frame for the brake grounds and do it right beside the hub on each side, there can be problems as a result of that though. If the ground attachment point gets at all rusty it can result in brakes that work one minute but dont the next. Dexter's trouble shooting guide suggests its better if the ground goes all the way back to the trailers main grounding point. Dont ask how I found that out!
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Old 10-22-2012, 12:05 PM   #30
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Raz, The Scamp electric brakes use the frame as the negative path. Do you have electric brakes?
yes, the trailer has brakes. No connection to the frame I'm happy to say.

Edit-Come to think of it, the brake connection on the Scamp explains why they use the 8 gauge chassis ground.
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Old 10-22-2012, 12:06 PM   #31
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Originally Posted by Jon Vermilye View Post
An "interesting" problem comes with the advent of LED exterior lights - they draw so little current that an unplugged trailer connector resting on moist leaves, ground, or open to falling rain, etc can make them "glow".


This is the closest answer yet to why my running lights came on when I turned on the interior lights...

I see now that I forgot to mention the most perplexing (to me) detail of that very educational experience:
Although they're on the same circuit as the running lights, the taillights didn't light up!

I was so mystified by this phenomenon that I posted a question about it at IRV2, and here's the answer I got, here quoting IRV2 Member Paul Haller:

" With a bad ground the electricity is looking to get back home to the battery any way it can. It will always choose the path of least resistance. Your LED light draws almost no current or amps. The Filiment in the tail lights gives off way more heat then light and as a result more amps and more resistance to flow. When turning on the light in the trailer the current followed Ohms law and followed the path of least resistance through the LED but not the tailights. "

How simple and brilliant is that for an explanation? And in language I understood, too...no small thing to an electrical Moron like me

Here's a link to that thread in case anyone's interested in reading the rest of it:
Electrical Weirdness - iRV2 Forums

Onward through the fog....

Francesca
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Old 10-22-2012, 04:50 PM   #32
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Check the NEC Article Covering RVs - Article 551

Steve & Raz - is there a bond between the converter case & the trailer frame in your trailers? If not, there should be.

While there should not be a bond between the neutral & the trailer frame, the enclosure must be bonded to the chassis (frame).

Here is NEC 551.20 (C):

"(C). Bonding Voltage Converter Enclosures - The noncurrent-
carrying metal enclosure of the voltage converter
shall be connected to the frame of the vehicle with a minimum
8 AWG copper conductor. The voltage converter shall
be provided with a separate chassis bonding conductor that
shall not be used as a current-carrying conductor."

Article 551.56 covers the 120V side of things -

"551.46 Bonding of Non-Current-Carrying Metal Parts.

(A) Required Bonding. All exposed non-current-carrying
metal parts that may become energized shall be effectively
bonded to the grounding terminal or enclosure of the distribution
panelboard.

( Bonding Chassis. *That is suppose to be a "B" not a smiley*
A bonding conductor shall be connected
between any distribution panelboard and an accessible
terminal on the chassis. Aluminum or copper-clad aluminum
conductors shall not be used for bonding if such conductors or
their terminals are exposed to corrosive elements.

Exception: Any recreational vehicle that employs a unitized
metal chassis-frame construction to which the distribution
panelboard is securely fastened with a bolt(s) and
nut(s) or by welding or riveting shall be considered to be
bonded.


There is more that covers things like gas lines, metal roofs, furnace & ducts, etc but the end result is that the ground system of the trailer must be connected to the chassis (frame).
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Old 10-22-2012, 05:07 PM   #33
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This is the closest answer yet to why my running lights came on when I turned on the interior lights...

I see now that I forgot to mention the most perplexing (to me) detail of that very educational experience:
Although they're on the same circuit as the running lights, the taillights didn't light up!


They Are NOT on the same circuit.
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Old 10-22-2012, 07:18 PM   #34
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Originally Posted by Darwin Maring View Post
This is the closest answer yet to why my running lights came on when I turned on the interior lights...

I see now that I forgot to mention the most perplexing (to me) detail of that very educational experience:
Although they're on the same circuit as the running lights, the taillights didn't light up!


They Are NOT on the same circuit.


Yes- they are: Please take a look at the wiring diagram for the early Trilliums located here in the document center.
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Old 10-23-2012, 07:41 AM   #35
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Steve & Raz - is there a bond between the converter case & the trailer frame in your trailers? If not, there should be.
bme).
Absolutely no electrical connection to the frame on our Trillium. At home we power through a GFCI and we don't use shore power on the road, don't even take a cord. But if I decide to ever sell I will connect one. Thanks for doing the research. Raz
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Old 10-23-2012, 10:02 AM   #36
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The tail lights and running lights should be on the same circuit powered by the tow vehicle battery. The interior lights should be on a separate circuit powered by the trailer battery.
I'm not sure how this even came up! Everything in my trailer is wired correctly, and as described above, as I thought I'd indicated... no connection between exterior/interior lights EXCEPT that they share the common trailer groundwire.

Strange symptoms aside, the fault in my case was neglecting to connect the new taillights directly to the trailer ground, instead relying on the metal body of the bumper box. Since I corrected this, everything's worked fine.
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Old 10-23-2012, 11:32 AM   #37
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A friend contacted me when she arrived home last evening her Bigfoot 19 marker lights were on. The trailer is not hooked up to shore power or tow vehicle. Any ideas?
Found the problem. Trailer light plug in cable had a large gash in it exposing the wires. It is all repaired now.
Chuck
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Old 10-23-2012, 12:25 PM   #38
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Found the problem. Trailer light plug in cable had a large gash in it exposing the wires. It is all repaired now.
Chuck
Thanks for the latest update O.P.!

Now to Miss Curiosity's big question for anyone still listening: Why did that gash/exposed wires on the pigtail of a disconnected trailer cause the markers to come on?

Francesca, too cheap to go to school and pay for her own education
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Old 10-23-2012, 12:30 PM   #39
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Thanks for the latest update O.P.!

Now to Miss Curiosity's big question for anyone still listening: Why did that gash/exposed wires on the pigtail of a disconnected trailer cause the markers to come on?

Francesca, too cheap to go to school and pay for her own education

My guess is that when the wire was gashed, some of the copper strands were overlapped between the wire carrying 12 volts (from TV to trailer battery) and the wire carrying power from the TV to the marker lights.
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Old 10-23-2012, 12:38 PM   #40
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My guess is that when the wire was gashed, some of the copper strands were overlapped between the wire carrying 12 volts (from TV to trailer battery) and the wire carrying power from the TV to the marker lights.
But- the opening post says:

Quote:
Originally Posted by Deb & Chuck View Post
A friend contacted me when she arrived home last evening her Bigfoot 19 marker lights were on. The trailer is not hooked up to shore power or tow vehicle. Any ideas?
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Old 10-23-2012, 12:50 PM   #41
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Thomas is correct. It had to have a connection between the on-board battery wire to the outside light. It is impossible for it to light up without that connection.
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Old 10-23-2012, 12:52 PM   #42
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Thomas is correct. It had to have a connection between the on-board battery wire to the outside light. It is impossible for it to light up without that connection.
But-
Thomas's scenario requires a connection to the tow vehicle, which according to the O.P. didn't exist.
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