Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Travel Trailer Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 07-05-2011, 09:45 AM   #1
Junior Member
Join Date: Jul 2011
Posts: 2
12vdc interior lights don't work

I just purchased a used 2007 Mallard 27' tt. I was going through it to make sure the lights and appliances all worked when I came across a problem. In my slide out the 12vdc interior lights do not come on. There is power to the switch and when I take out the light bulbs there is power at the light. Where I am confused is when I put a brand new bulb in the light and test power again at the light and switch there is no 12v anymore. I dont understand how there could be power before the light bulb then none after a bulb is installed. Please help!!! FYI the other interior lights and all 12vdc appliances all work with no problems and batteries do charge.

My second problem is at the distribution panel when I tested all my fuses (all good) I noticed that when they were removed there was 12vdc present on both sides of where the fuse goes. If there is power on both sides what is the point of having a fuse in there since the power doesnt seem to go through it? Is this normal on travel trailers because once a fuse in a car is removed then there is no power on the other side. Please help!!!

Thanks JBS

jbs is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-05-2011, 10:37 AM   #2
Moderator Emeritus
RickO's Avatar

Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 10,530
Hi and welcome to the forum! That sounds like some very strange stuff going on and I'll leave it to some of our trailer experts to chime in but wanted to welcome you. We're glad you found us.


Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
RickO is offline   Reply With Quote
Old 07-06-2011, 06:04 AM   #3
Junior Member
Join Date: May 2011
Posts: 17
Sounds like a dead short, you have power until you add a load on the line. Not the same but I had this at the campground whereI work on a pedistal.
We had full power until a load was added, I pluged in a hair dryer and we had 25V blead out on the water faucet. You may have a bare wire under the slide shorting on the frame.
Scott and Jeanna, 2000 Sunnybrook 29DBS TT
Sorry we missed church, we were camping in the woods practicing witchcraft.
bigeasy is offline   Reply With Quote
Old 07-06-2011, 09:37 AM   #4
Junior Member
Join Date: Jul 2011
Posts: 2
With a short would the fuse still be good? I put the slide out and looked at the wire that extend with the slide but I didnt see any exposed wires. While I was down there i did wrap elec tape around any wire that was not in the plastic tubing. I guess I will have to take a real close look at where ever those wires go throughout the trailer. Thanks
jbs is offline   Reply With Quote
Old 07-06-2011, 11:37 AM   #5
Senior Member
texnet's Avatar
Monaco Owners Club
Join Date: Apr 2009
Location: Granbury, Texas
Posts: 1,364
I would look for a bad ground. And, yes... if it was shorted on the fused side the fuse would be blown. If it was shorted prior to the fuse then wires would be melted :-)
Ronnie (WD5GIC) & Jan (WD5IHU)
2003 Monaco Dynasty Countess 42' w/tag, 2012 Ford Flex

texnet is offline   Reply With Quote
Old 07-06-2011, 12:11 PM   #6
Senior Member
Fleetwood Owners Club
Join Date: Dec 2004
Posts: 527
Your ground buss is not ground. Test the buss to frame. Frame might also not be ground. Measure you voltage between the frame and the ground. If that is ground then look for a loose connect between buss and frame.
targaboat is offline   Reply With Quote
Old 07-06-2011, 12:50 PM   #7
Senior Member
Join Date: Apr 2011
Posts: 250
As Mentioned,Bad Ground #1, Bad connection in the light fixture #2, Defective connection at the switch or bad switch.
If you are reading 12 volts with a digital Multimeter the circuit load is so low you can read potential voltage of the circuit.
if all the above items check out,and the fuse is good. Check for a loose or broken wire. Good test is to use 12 volt pigtail and connect it to the positive wire and ground the other one somewhere.
good light =s good 12 volt feed. then t has to be the ground or light fixture.


Airtool is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need schematic for 12vdc to fuse panel stubeje Newmar Owner's Forum 9 11-01-2013 12:35 PM
Best internet system for full-time work? LindaCW Technology: Internet, TV, Satellite, Cell Phones, etc. 36 06-30-2011 11:00 AM
Warranty Work by Third Party Companies GerriBa Newmar Owner's Forum 4 06-29-2009 07:04 PM
warranty/repair svc work questionable ladyrvr66 Monaco Owner's Forum 11 03-15-2007 04:54 PM
Part Time Work Lee and MaryJane Full-Timers 7 02-16-2007 12:10 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:02 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.