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CALVINIST

Trailer lighting problem...

9 posts in this topic

The problem is this: the only lights that work are the running lights. Blinkers and brake lights do not work.

Things to consider...

1. New wiring put in just last year.

2. New lights put on just 3 weeks ago.

3. When I first encountered this problem, I hooked up the vehicle end to a different trailer, and all the lights worked on the trailer, so I know the problem isn't on the vehicle side of things.

4. Once I determined that, I bought a new connector for the trailer, just in case I had a bad connector. The result is the same. Running lights are all that work.

5. The whole thing was working just fine after installing the new lights.

6. I checked the vehicle fuses and all are ok.

I am puzzled about this. Anyone have a clue?

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Simple bad ground.

Airjer can explain it better....but I'll try.

My trailer lights were working just like yours last week, first off I re-grounded the light hookup on the trailer I pulled the phillips screw out and I took a grinder and got down to the bare steel on the trailer I then attached the white wire back to the frame, then I removed the rear trailer lights and grounded/sanded those areas down to the bare frame so the nuts, and bolts would have good contact with the frame.

Bingo..... all lights working.

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Yeah, my trailer is a bit crusty. Thanks Pierbridge, that sounds like a simple, cost-free solution. I'll give it a whirl and report back.

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With 12V system problems, 99% of the time it's the ground.

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The other lights are working and did not stop working when the brake lights where turned on which implies that this is not a ground issue. It could be but typically if the ground is bad nothing will work or something will be quirky. The place I would start is the sockets for the tail/stop lights. With the trailer hooked up to the vehicle and the running lights on and someone stepping on the brakes, check for power at the two bottons in the bottom of the socket. They should both light up. If they do than I would say there is a stronger possibility that the ground is suspect. If one doesn't than we have an open circuit. If this is the case I would start backprobing that circuit starting at the front and working my way back until I lost power. Repair the broken or corroded wire and your back in business!

Good Luck!

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Running lights sometimes still work on a bad ground. The "dead" brake/turn signal wires can leak enough current back to complete the circuit, I believe. I've also had trailers where I could light up the running lights with no ground at all.

-r-

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Did you check the bulbs? The feliment in the bulb for the stop, blinker is longer, on rough roads the feliment breaks on the stop, blinker side, then you have no break or blinker lites. I live on a gravel road and when it gets washboardy, I some times find a stop that doesn;t work. You can buy heavyer feliment bulbs if this is the case.

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also, make sure you have the bulbs with two filaments. I made the mistake of buying single filament bulbs once and only the taillights worked, no brakes.

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I had this same problem with a trailer I had this year. Turned out it wasn't the wiring, it was the adapter on my truck. I have to go from round (on my truck) to the 4 pin. Got a new adapter and it worked great. I know you said it worked with another rig, but it was a cheap $10 fix for me.

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  • Posts

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      2 hours ago, JBMasterAngler said:

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    • JBMasterAngler

      Posted

      Drove all the way up to grindstone this morning from Forest Lake. As I'm driving along the shoreline, I can't stop admiring how beautiful of a day it is, and how great it will be to be on the water. Was totally amped up to fish for some trout! Then I pull up to the boat launch...and it's closed down! :mad: This dredging project has been pushed back for years, then they finally decide to do it on a beautiful sunny day, that I picked to come here...on the last day of the lake trout season nonetheless! Needless to say, I was very upset! 

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      1 hour ago, delcecchi said:

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      Posted

      I bet the state, not the political cronies, would get a lot more money by having the auction on the internet or allowing phone bids.  Heck, put them on the bay of E. 

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  • Posts

    • leech~~
      Could have throw a line off the south shore since you were all the way up there.
    • easyrider25
      Hey guys thanks for the tips.  What you are saying really makes sense.  I have been working on these items this week, not expecting a completely changed dog out there but looking forward to continued exercises this weekend out in the blind.
    • JBMasterAngler
      Drove all the way up to grindstone this morning from Forest Lake. As I'm driving along the shoreline, I can't stop admiring how beautiful of a day it is, and how great it will be to be on the water. Was totally amped up to fish for some trout! Then I pull up to the boat launch...and it's closed down!  This dredging project has been pushed back for years, then they finally decide to do it on a beautiful sunny day, that I picked to come here...on the last day of the lake trout season nonetheless! Needless to say, I was very upset! 
    • papadarv
      Actually DMV and DNR do quite well at their auctions. You win bid, You Pay, You own. No red tape, no collection process, simple and things seem to sell for quite a bit of money. Go and one see for yourself, its quite amazing. Lots of them at the Arden Hills DMV. Hard to collect money over the phone and on the internet. I do believe they will use the same auction process for this property sale as the DMV and DNR are good at it and a lot of buyers will be there. If the internet were to be used, the "political cronies" would need to create a bill, Ear Mark several million to develop a site, create an app, hire 40 to 50 people to manage and than increase taxes to cover the cost much like Obama Care Not a good plan. If your interested, go to auction, bring lots of money, win a bid and own. 2016 MN auction schedule if your interested in going to one. http://mn.gov/admin/citizen/surplus-property/auctions/schedule/
    • SpecialK
      They were dredging there today. Not sure if they are done or if it will take longer.