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Old 09-30-2014, 04:10 PM   #1
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1975 25' Tradewind
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No Running Lights...HELP!!

Hi everyone...

About to get on the road so i decided to replace all the lights on the exterior of my trailer.

The problem is now all the running lights do not work.

Heres what i have checked so far:

1. took apart the 7 pin. not it.
2. checked all lights for good ground. not it.
3. Tow vehicle is 08 tundra. checked fuses...not it either
4. screamed.several times...did not help. but felt better.
5. cleaned connectors of all 7 pins with wire dryer...nope.
6. post to the forum...for help...

If anyone out there has any suggestions. I will say the rear running lights were not working prior to my changing them out...

The turn signals work fine. the brake signals work fine.

All running lights are on vacation.

It feels like a no power issue, or blown fuse...but is there a fuse on the running lights?

Help me...
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Old 09-30-2014, 04:19 PM   #2
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Get a test light, find out where you have power and where you do not.

My guess is that somewhere in the process you made a short to ground.
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Old 09-30-2014, 04:20 PM   #3
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Check 12 volt fuses on fuse panel in trailer, mine are inside of panel next to door, there should be slide panel [book holder] fuzes behind there, maybe prob.? Bill
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Old 09-30-2014, 04:21 PM   #4
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I can not over emphasize to usefulness an NEED OF A 12v test light.
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Old 09-30-2014, 04:22 PM   #5
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There will be no fuses in the trailer connected to the parking lights. Any fuse related to the parking lights will be in the truck and will effect the truck as well.

You have to start at the truck 7 pin connection and test to see if you have voltage on the tail light pin. If not the problem is in the truck. Then go to the end of the umbilical inside the trailer and test the green wire at that point. If not the problem is either in the male plug or in the umbilical itself.

I am sure you will find the problem before that point because that is the last place that all the parking lights have in common.
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Old 09-30-2014, 06:06 PM   #6
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When I picked up my TT for the first time, the connections had all been perfectly made, but the fuse under the hood of my TV was simply not there. Popped in a fuse and bingo.

HowieE is right, the TV supplies power for the running lights, not the TT.
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Old 09-30-2014, 06:06 PM   #7
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No Running Lights...HELP!!

I dont know about this Toyota, but I know at least some Dodge prouducts and at least some GM products will have truck and trailer lights on separate circuits.

So it may be possible that truck running lights work and the truck will not supply power to the trailer. This used to be accomplished with fusing, but now Ram does it through a "buss".

It kind of sucks that simple fusing has been abandoned. I don't know how Toyota does this....

Like I said, get a test light you will not regret doing so,

When you know where you have juice and where you do not fixing the issue becomes much easier.
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Old 10-01-2014, 04:21 PM   #8
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Sooooooo...still not finding the problem.

Today i pulled all the lights...re tapped them over the shrink wrap...just in case.
Then got the circuit tester from Orilleys and begin testing all fuses.

All the ones in my tow vehicle are fine. 08 tundra has 3 - 30a in the engine.
Turned the truck on and checked the umbilical...only 2 are showing active.

the top two on the truck which is the running lights.

so not it has to be the trailer.

If one of the lights are bad then all the lights are bad? is that how it works.

do i need to take my light thingy and go through all the lights with the trailer hooked up?

will that show me the problem light?

Or is it the truck. If only the top two are showing power is it a bad relay?
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Old 10-01-2014, 04:36 PM   #9
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With the plug wedge at the top, the top 2 pins should be hot. The ones at 3 and 9 are turn signals. If all of these are hot on the TV, then the problem is between the umbilical plug and each light. Since the turn signals work, there must be an open in the common wire for the running lights.

The lights are not in series. even if only 1 is good it should still light. Your problem is in the common trailer wire for running/license lights.
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Old 10-01-2014, 04:41 PM   #10
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Does a single wire matter on the lights? Its one line in and grounded on one screw, i should post a picture...theres one plug that comes in from the trailer connected to the light and the other one is ground to the screw.

Is this the wrong lights...?
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Old 10-01-2014, 04:49 PM   #11
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Here are the lights....

Peterson Amber Bullseye Side Marker Light - Mills Fleet Farm

the running side lights and got the red ones for the back...

Peterson Amber 2-Bulb Side Marker Light - Mills Fleet Farm
three across the middle.
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Old 10-01-2014, 04:50 PM   #12
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First answer this question. With the tail lights turned on and the truck running.

With a test light or bolt meter touch the 2 terminals at the top of the receptacle on the rear of the truck.

Do you have voltage on both?

If yes turn the tail lights off to confer magicked is the tail lights

If you do not have voltage on both again turn the tail lights off to confirm. If you loose voltage on that terminal.

I ask it this way because some newer trucks do not apply voltage to the battery charge circuit until the truck is running




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Old 10-01-2014, 04:51 PM   #13
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Quote:
Originally Posted by richw46 View Post
there must be an open in the common wire for the running lights.

The lights are not in series. even if only 1 is good it should still light. Your problem is in the common trailer wire for running/license lights.
where is this?
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Old 10-01-2014, 04:55 PM   #14
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Quote:
Originally Posted by richw46 View Post
With the plug wedge at the top, the top 2 pins should be hot. The ones at 3 and 9 are turn signals. If all of these are hot on the TV, then the problem is between the umbilical plug and each light. Since the turn signals work, there must be an open in the common wire for the running lights.

The lights are not in series. even if only 1 is good it should still light. Your problem is in the common trailer wire for running/license lights.
Quote:
Originally Posted by HowieE View Post
First answer this question. With the tail lights turned on and the truck running.

With a test light or bolt meter touch the 2 terminals at the top of the receptacle on the rear of the truck.

Do you have voltage on both?

If yes turn the tail lights off to confer magicked is the tail lights

If you do not have voltage on both again turn the tail lights off to confirm. If you loose voltage on that terminal.

I ask it this way because some newer trucks do not apply voltage to the battery charge circuit until the truck is running




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Truck is hot both on and off...power either way. Only to those 2 circuits on 7 pin
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Old 10-01-2014, 05:50 PM   #15
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Picture of wired light.



it is not the truck. Had a friend meet me here in an f150. No running lights.

https://www.dropbox.com/sc/rgmmksl9u...aseNrH0cQrzY1a
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Old 10-01-2014, 07:44 PM   #16
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where is this?
Get a 12v test light.
Bare the wire from the trailer that goes to any of the marker lights (careful not to touch the trailer)
Connect 1 test light wire to the trailer wire you just bared, other to ground
Hook up the TV, parking lights on

If the test light doesn't light up you have an open between the trailer pig tail plug and the marker lights. I would check the plug's condition, see if there are any breaks on the plug to pig tail wires

If the test light does light up, you have power but the lights aren't installed correctly. Either the power or the ground isn't connected properly

If the test light doesn't work and the pig tail plug looks good then you have a problem unless you can trace the 12v marker light wire from the trailer pig tail to the trailer marker light connection / junction. I don't know where this is but since all of the lights are out it would seem that this is your problem.
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Old 10-02-2014, 11:47 AM   #17
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Soooooooo....today. I blew a 30 amp fuse. I disconnected the 15 amp circuit breaker on the white box inside the trailer.
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Old 10-02-2014, 11:51 AM   #18
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Then I checked the lines inside the trailer and got no power to ANY of the circuits.

Reconnected the wire and blew it again.

I am now replacing the umbilical...one of the lights should have worked ... but with out the breaker the line blew. So it has to be the umbilical cord.
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Old 10-02-2014, 02:47 PM   #19
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Quote:
Originally Posted by tallredboned View Post
Then I checked the lines inside the trailer and got no power to ANY of the circuits.

Reconnected the wire and blew it again.

I am now replacing the umbilical...one of the lights should have worked ... but with out the breaker the line blew. So it has to be the umbilical cord.
You have to realize there are NO fuses in the trailer that have anything to do with the taillights.

Likewise you have to till us what 30 amp fuse you blew and what you were doing when that happened. Again there is No 30 amp fuse or breaker that would be connected to the taillights.

Did you do the tests I noted above?

Troubleshoot electricity is a very exact science and requires detailed input. Comments that are completely out of the realm of possibility through us for a loop.
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Old 10-02-2014, 08:13 PM   #20
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Found it...

There is a breaker box behind the 7 pin on the trailer. Replaced the breaker with a larger breaker and added some power. After I replaced the umbilical cord.

Top front light burnt up. Found the short.
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