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#572630 - 07/30/19 06:03 AM Lights  
Joined: Aug 2004
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On Holiday Offline
Daddy
On Holiday  Offline
Daddy
Admiral

Joined: Aug 2004
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PA and Smith Mountain Lake
I hooked up the trailer to our 3/4 ton diesel truck and saw that our right turn signal and brake lights did not work however the light shined when just the headlights were on. I switched the two lights to see if it was a light issue or something else and the results were still the same. I was hoping it was a light issue. I then hooked up the trailer to our 1/2 ton truck to see if it was a truck issue and the lights worked just fine. With these results I took the trailer to get inspected knowing it wasn't a trailer issue.

Now that the trailer was hooked up to the 1/2 ton truck I just kept it that way for my 10 mile tow to drop off the trailer for inspection and o what a difference it was towing with the 1/2 ton as I felt every bit of the 5800 pounds back there. Next step is to trouble shoot the truck and see why the lights aren't working. I will say there is one thing that I don't care about the Dodge is the number of issues I've had with lights.


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2008 Honda Goldwing Trike
2006 Regal 2400
2004 Dodge Ram 2500
2003 Ford F-150
2002 Harley Davidson Roadking Classic


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#572631 - 07/30/19 09:11 AM Re: Lights [Re: On Holiday]  
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captkevin Offline
Admiral
captkevin  Offline
Admiral

Joined: Oct 2003
Posts: 7,633
Chicago, IL
Always a pain when things don't work as they should. Do you know if the truck has the factory trailer wiring or was it added? My 2002 Ram did not come with factory wiring & we had to add it ourselves. Still works so we must have done a good job. Noticed just recently that we have a brake light out on our trailer. Didn't think about possibility of it being truck related. Will throw in the tester & check it out before replacing. Good luck with yours.


2004 Rinker 232
2010 Dodge Ram Crew Cab Laramie 4x4
#572632 - 07/30/19 02:24 PM Re: Lights [Re: On Holiday]  
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On Holiday Offline
Daddy
On Holiday  Offline
Daddy
Admiral

Joined: Aug 2004
Posts: 6,531
PA and Smith Mountain Lake
Original factory trailer wiring is included.


2017 Honda Accord Hybrid
2008 Honda Goldwing Trike
2006 Regal 2400
2004 Dodge Ram 2500
2003 Ford F-150
2002 Harley Davidson Roadking Classic


#572634 - 07/31/19 01:52 PM Re: Lights [Re: On Holiday]  
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Frantically Relaxing Offline
Admiral
Frantically Relaxing  Offline
Admiral

Joined: Feb 2003
Posts: 11,870
Just going from my fading memory, but in my F-250 under the hood, I believe there's a fuse box specifically for the trailer wiring, and that each bulb function- left light, left brake, right light, right brake, backup lights- has it's own fuse. Your's may too?


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#572635 - 08/01/19 03:25 AM Re: Lights [Re: On Holiday]  
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Jack T Offline
Admiral
Jack T  Offline
Admiral

Joined: Jan 2003
Posts: 3,977
Southern California
I'll bet anybody out there that this is a ground problem-bad ground anywhere in the circuitry, usually at the ground point at the hitch or the trailer coupler.. If the bulbs are common incandescent, sometimes there can be a "backward current" flow through one of the filaments.

Oh, no takers? I guess I'll just keep the money.. (:-)


Have a great day of boating
2012 Monterey 224 FS,
300 HP Volvo Penta with catalytic converters

#572638 - 08/01/19 09:32 PM Re: Lights [Re: On Holiday]  
Joined: Feb 2003
Posts: 11,870
Frantically Relaxing Offline
Admiral
Frantically Relaxing  Offline
Admiral

Joined: Feb 2003
Posts: 11,870
I'm an "If-Then" flowchart kinda guy when it comes to troubleshooting.. So here's my take:

If there was a ground problem with the trailer, it would repeat regardless of the tow vehicle--
It didn't repeat, there was no problem with vehicle 2...

--this should rule out trailer ground as a problem...

The factory ground from both tow vehicles *should be* common to all loads (bulbs) via a single ground wire from the connector rather than a 'hitch ground'--
If true, then all loads should be well grounded.
If not true, then an intermittent fault could cause a fluke 'good' connection with Vehicle 2. Odds of this: 1 in 10, maybe?

--assuming single wire ground, this should rule out tow vehicle ground as a problem, which in turn essentially eliminates ground as the problem...

Which leaves us with a load specific 'hot' problem, the right brake filament being the specific load-
A working right filament with vehicle 2 tells us the problem is specific to vehicle 1: No 12 volt output from the right brake filament plug connector...

WHY is the next issue to troubleshoot-- blown fuse? Bad connection at the tow vehicle plug? Bad plug? Bad or broken wire TO the plug or AT the plug?

All this is easy to test with a voltmeter; first thing to check is to turn on taillights and flashers and check the tow vehicle's output at each wire connector for volts,
and be sure the voltmeter's ground probe is using the plug's pin-connector ground, not somewhere on the truck...


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#572639 - 08/02/19 12:16 AM Re: Lights [Re: On Holiday]  
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Jack T Offline
Admiral
Jack T  Offline
Admiral

Joined: Jan 2003
Posts: 3,977
Southern California
Thanks FR.
What I said--or meant. Just a much better explanation..

"Original factory trailer wiring is included."
Just because it is factory doesn't meant something has gone amuck since it left the factory..


Have a great day of boating
2012 Monterey 224 FS,
300 HP Volvo Penta with catalytic converters

#572693 - 08/12/19 10:46 AM Re: Lights [Re: On Holiday]  
Joined: Aug 2004
Posts: 6,531
On Holiday Offline
Daddy
On Holiday  Offline
Daddy
Admiral

Joined: Aug 2004
Posts: 6,531
PA and Smith Mountain Lake
I'm going to check the fuse in the truck.

I just came back from the lake, on the trip down I had a message on the dash that I had a bulb out. On the way home a week later I had no bulb out message. The boat and trailer was left at the lake and will bring it back home in October.


2017 Honda Accord Hybrid
2008 Honda Goldwing Trike
2006 Regal 2400
2004 Dodge Ram 2500
2003 Ford F-150
2002 Harley Davidson Roadking Classic


#572697 - 08/12/19 04:41 PM Re: Lights [Re: On Holiday]  
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casualboater Offline
Admiral
casualboater  Offline
Admiral

Joined: Jan 2004
Posts: 3,178
Highland, Michigan
For me, it's always the ground. I once had to disassemble the receptacle on my tow vehicle to find a corroded ground inside the assembly. Totally hidden, from the outside everything looked great.


1989 Larson DC 190
2017 GMC Acadia SLT-1
#572698 - 08/12/19 06:10 PM Re: Lights [Re: On Holiday]  
Joined: Oct 2003
Posts: 7,633
captkevin Offline
Admiral
captkevin  Offline
Admiral

Joined: Oct 2003
Posts: 7,633
Chicago, IL
On my 2002 Dodge Ram the light out warning can get real annoying. Sometimes it will go on & off over & over, Then goes away for awhile. Inevitably the failing bulb finally goes totally out & the issue can be resolved.


2004 Rinker 232
2010 Dodge Ram Crew Cab Laramie 4x4
#572708 - 08/13/19 09:06 PM Re: Lights [Re: On Holiday]  
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WayWeGo Offline
Admiral
WayWeGo  Offline
Admiral

Joined: Aug 2005
Posts: 2,433
Oakton, VA
For finding wiring issues on a car or boat, a Power Probe makes the job so much easier. It has a built in voltmeter and can ground or power the tip of the probe. You can test lights and switches with it, either in the circuit or separately. Not a cheap tool, until you look at the time you save. Now that I have one, I cannot imagine trying to troubleshoot without it. The model I picked is the Power Probe III with an assortment of tips and plugs, including ones that go into a blade type fuse holder and ones that can be inserted next to a wire on the back of a connector.



1975 Trojan F36 Convertible, Twin Chrysler 440's
2014 West Marine AL360 Inflatable, 1966 Mercury 6HP, 1992 Mercury 20HP

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