4-Pin trailer wiring stopped working. - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 07-21-2013
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4-Pin trailer wiring stopped working.

My left side trailer running lights stopped working on my trailer. Then the next day the left side break lights and left turn signal stopped working on the trailer. I played around with the wires and tried to trace it back to the problem which lead me to under the hood and then I got lost, but now the left signal and right signal not work lol. So now I have no lights and have no idea where the problem could be.

Is there a relay box under the hood somewhere that might just need some cleaning ? I checked all the fuses and they look good.
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Old 07-21-2013
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Anyone know where is the ford ranger converter box located exactly?
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Old 07-22-2013
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The reason the box will short out and not the fuse is because the fuse is between the battery and the converter, whereas the short is on the other side of the converter box.

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Old 07-22-2013
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The leading problem with Trailer LIghting is… GROUNDS, Trailer and Vehicle Frame !

Find the ground, check it out for connection, a good, clean solid connection is needed and the wire should be sized to carry all current, so if you replace the ground/wire make sure you replace it with a good size wire. (Unless you are going to LEDs then a smaller wire will be needed).
If the grounding is good then check the sockets in the lights and the main connection.
Dirt, road grim and corrosion will decrease the effectiveness of the connections.
Checking with a multimeter will tell you there is some sort of connection but not how good it is, unless you are good at it and know how to check the resistance of the connection then you will not know for sure, it is easier to just take them apart, clean them up and be done with it.

My buddy had a trailer, supposedly was new but lights would work and then stop an another would give him trouble. He asked me for help and the first thing I did was check for the ground, WHAT GROUND, there wasn’t any. The trailer was actually attempting to ground through the trailer hitch; no wonder the lighting was intermittent. We put in a ground wire from the Trailer Connector on the Trailer Frame and all the light worked. Once the boat was in the water he decided he wanted to convert to LEDs, we rewired the whole thing and ran separate ground wires for each side of the trailer and each light was connected with two wire, power and ground, soldered and heat shrink with adhesive inside was used.
4 years later he has no problems and mentions it once in a while, he says, “Man I have no lighting problems in the trailer for a long time", (asking for trouble), and all I can say is "No $hit” !

So check the grounding on both sides of the trailer hitch, double check the grounds on the trailer, do the disconnect, clean and use a good quality waterproof dielectric paste on all connections.

Chasing a bad connection on a trailer is more time than hard work but a PITA to say the least, luck to ya !
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Old 07-22-2013
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Quote:
Originally Posted by EleniBHernandez View Post
The reason the box will short out and not the fuse is because the fuse is between the battery and the converter, whereas the short is on the other side of the converter box.

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Yeah I believe this is my problem. Are the fuses right under the hood?
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Old 07-23-2013
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Have you checked for power at the Trail Connector on the rear of the truck ?

Is there any ?

If not then work backwards but if there is and it is working OK the problem is in the trailer wiring.

Find the general area first then find the problem.
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