Trailer wiring ?

marine6212

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#1
I borrowed a buddies trailer and the lights didn't work on it, they were broken and the wires were a rats nest.

I went to harbor freight and bought a light kit and ran the wires and hooked up the lights. I did the left side first and it worked as advertised, did the right side and they work but the left side quit working! It's a simple 4 flat plug with 1 ground, 2 brake/ turn wires, and 2 running lights wires.

What happened to the left side?


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Marine6212

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billr

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#2
What vehicle are you connecting this to? Have you tried disconnecting the right to see if the left come back on? How much current do these lights draw?
 
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#5
Did you check at the lamp assy - maybe a bulb, wiring to light socket, maybe wiring from plug to tail lamos
 

nickb2

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#6
I have run into similar problems like this before when fooling with trailer packages. The truck uses a stop lamp activation relay or something to that effect or trailer tow damper/ing relay.

This, in my previous case f uped the system and I had to install a heavy duty relay expressly for this reason. It looked something like this with it's own integrated circuit.

http://www.zungsung.com/en/product/Flasher-Relay-BF12-/ZS_0105.html

It could take the added current and not mess with the integrated power module, known as the TIPM. (totally integrated power module)

Dodge specifically states that when one side or the other becomes inoperative, a suspect TIPM module may be a culprit.

So if your sure that when you routed your trailer wiring package, no open was created for left side or vice versa, maybe that TIPM module was already on the fritz due to that mine field of a rats nest.
 

marine6212

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#7
I have run into similar problems like this before when fooling with trailer packages. The truck uses a stop lamp activation relay or something to that effect or trailer tow damper/ing relay.

This, in my previous case f uped the system and I had to install a heavy duty relay expressly for this reason. It looked something like this with it's own integrated circuit.

http://www.zungsung.com/en/product/Flasher-Relay-BF12-/ZS_0105.html

It could take the added current and not mess with the integrated power module, known as the TIPM. (totally integrated power module)

Dodge specifically states that when one side or the other becomes inoperative, a suspect TIPM module may be a culprit.

So if your sure that when you routed your trailer wiring package, no open was created for left side or vice versa, maybe that TIPM module was already on the fritz due to that mine field of a rats nest.
Hmm, looks like a trip to the dealer!
 

billr

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#8
Your choice, of course, but maybe we can help if you answer the questions asked. And, another one: do the regular vehicle lights work OK if the trailer is disconnected?
 

marine6212

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#10
Ok, just tested the truck side plug and it's working, running lights are 14+ volts, blinkers are fluctuating between 9.0 and 14+ volts.

Trailer plug just checked continuity at the plug and my meter beeps at me when I have the black lead on ground and touch red lead to any other plug wire!

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#14
Made my own utility trailer from an old boat trailer, cut the tongue, used pressure treated wood, still good after some 35 years. Large enough to haul 4 by 8 panels. Newer stuff for pulling it has separate brake and turn signal lights. Cheapest thing I could do was to buy a couple of trailer lamps for a couple of bucks each mounted next to the brake lights on the back.

Using a four pin connector, but had to add one more wire using a 1/4" spade connector. Ground, tail lamps, left directional, right directional, and brakes. Can use amber for the directionals just like cars do, no problems with the cops.

Boat trailer has a tilting bed, could drive my riding mower up on it to cut grandma's grass, try hauling 4 by 8 drywall in a pickup truck.