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In this section we share and discuss various technical advise that help fellow campers in general or regarding specific questions.

Any advice for towbar 7pin socket issues?

replies: 20
views: 262
23 Jun, 2022 @ 22:26:42 pm
Kashvir
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About two weeks ago I had an issue where my caravan lights stopped working. So I inspected inside the bulb housing

-replaced two blown bulbs

-also removed some corrosion from the contact points with a wire brush

-and ended up running a new cable to the body for ground as the old grounding point did not work for some reason although it had no signs of corrosion.

The lights finally worked again and I was happy. A week or so later I had serviced the breaks and wheel bearings and decided to take the caravan for a test run.

Once hitched and plugged in I noticed that none of the lights seemed to work. I checked the bulb housing and everything was fine. I checked the Male 7 pin connector (on the caravan) and noticed that it had been severely corroded inside after opening it up.

-I cleaned it with a wire brush as best as possible.

-I then downloaded the 7pin wiring diagram from the internet to understand the colour coding and make certain that everything  was infact correct.

-I supplied 12VDC via a power supply unit between the ground pin and the other pins in the socket to test the connection and all the lights powered on each time their pin had been probed.

From the above I determined that there wasn't an issue with the caravan wiring but rather with something on the tow vehicle, so I started to check up there next.

-I opened out the towbar socket (female type mounted on the vehicle) and inspected it.

-there was very little corrosion but I did clean it with a wire brush just to make certain.

-I tested for continuity with a  multimeter between the ground pin inside the socket and the body of the vehicle and the ground had good continuity between those points.

-I then tested for continuity between the ground pin and the other pins inside the 7pin socket, and there was no continuity as it should be.

-I probed all the pins inside the socket for continuity between each other to make certain that none of them were contacting one another.

-I found continuity between the park light pins inside the socket which meant that they were linked to each other, and I dont think that would cause any harm as it worked fine before.

MAIN FAULTS FOUND;

- multimeter indicates 12VDC  reading in the pin socket attached to the vehicle when light is switched on from within the vehicle, however that 12VDC cannot power on my test light probe. (The probe is working even 5V can make it glow) despite testing a direct ground from the battery and also a direct ground from body, the test probe doesn't glow or turn on. So theres a voltage reading but bulb won't activate.

-given my basic understanding from research and testing, the 7 pin female socket should have just one ground pin and the other 6 pins should have positive end wires joined to them from the vehicle's wiring harness/loom. The strange thing is that if I select the DC option on my multimeter and probe between any two positive pins in the socket I get a 12VDC reading, indicating that somehow two positive wires complete the circuit. This is baffling as stated above that theres no continuity between pins with exception to the tail light pins which are linked together.

Any advice or clarification will be highly appreciated.

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 08:02:16 am
Andrew
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These trailer plugs are a real pain and sounds like a corrosion problem, the 12v is there but under load it won`t work .  What I have done is bought new male and female plugs ,double the wire over at the end and soldered the wires so it is a tight fit in the plug and tighten the screw , then put a blob of varnish on the screw end to prevent any corrosion. I have modified the lights at the back of the van and soldered in those 3 LED module strips you  get for flicker,brake,and park , they are brighter and take less current and never had a days issue since as the normal globes always seem to corrode easily and give a bad contact. I have found some caravans that use the towball as an earth but found this unreliable. Remember the park lights are on two separate wires.

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5 days ago @ 08:21:28 am
Relaxed Camper
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Ek het op my kar gekry n boksie met n pc-board gekry weggesteek in die agterste bumper wat nat geword het....boksie vervang en alles was weer okay 

WAARSKUWING:

Kampeer is aansteeklik en verslawend 😁
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5 days ago @ 08:21:50 am
Kashvir
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These trailer plugs are a real pain and sounds like a corrosion problem, the 12v is there but under load it won`t work .  What I have done is bought new male and female plugs ,double the wire over at the end and soldered the wires so it is a tight fit in the plug and tighten the screw , then put a blob of varnish on the screw end to prevent any corrosion. I have modified the lights at the back of the van and soldered in those 3 LED module strips you  get for flicker,brake,and park , they are brighter and take less current and never had a days issue since as the normal globes always seem to corrode easily and give a bad contact. I have found some caravans that use the towball as an earth but found this unreliable. Remember the park lights are on two separate wires.

Thanks for the suggestion Andrew I will buy new Male and female plugs as you have since mine has corrosion on it too. The varnish is a handy tip I will make certain to do that as well. ⭐⭐⭐⭐⭐

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 08:22:28 am
Wetkit
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Not sure what you use to tow with, but the newer type cars do not use relays to power outputs.

So an output might show voltage, but if the car reccon the load is either too high or too low, it might switch the output off.

This is the same issue where you upgrade the caravan lights to LED and suddenly there is issues with the lights either not working or flickering.

I would think that if both plugs is nice and clean, you should not have any issues.

I have however seen that my wires can have corrosion issues. Also close to the coast. Best is to either have the ends crimped or soldered.

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5 days ago @ 08:23:29 am
Relaxed Camper
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Ek het op my kar gekry n boksie met n pc-board gekry weggesteek in die agterste bumper wat nat geword het....boksie vervang en alles was weer okay 

Nattigheid op pc-board het ligte laat malfunction  

WAARSKUWING:

Kampeer is aansteeklik en verslawend 😁
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5 days ago @ 08:40:39 am
Kashvir
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Ek het nooit daarvan geweet nie. Ek sal daarna kyk. Dankie.

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 09:23:32 am
Nico
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Interesting! I spray some electrical cleaner on my connections (both the trailer plug and the leads for the rearview camera). It seems to work well. Like the idea of the varnish though .....

On this point, something I have done for ages, is to drop some Wynn's for Oil on battery terminals after fitting the cables. This also prevents acid to form, but think that this won't do on the trailer plug, as it will collect dust.

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5 days ago @ 09:23:35 am
Kashvir
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Not sure what you use to tow with, but the newer type cars do not use relays to power outputs.

So an output might show voltage, but if the car reccon the load is either too high or too low, it might switch the output off.

This is the same issue where you upgrade the caravan lights to LED and suddenly there is issues with the lights either not working or flickering.

I would think that if both plugs is nice and clean, you should not have any issues.

I have however seen that my wires can have corrosion issues. Also close to the coast. Best is to either have the ends crimped or soldered.

I'm towing it with my bakkie. Tata Xenon 4×4 DLE. I'm unsure about the wiring. I will need to take a look. If it's too complicated I will book it in with an auto electrician as i don't want to end up doing something wrong and burning the vehicle.😅

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 09:28:17 am
Kashvir
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Interesting! I spray some electrical cleaner on my connections (both the trailer plug and the leads for the rearview camera). It seems to work well. Like the idea of the varnish though .....

On this point, something I have done for ages, is to drop some Wynn's for Oil on battery terminals after fitting the cables. This also prevents acid to form, but think that this won't do on the trailer plug, as it will collect dust.

I used electrical cleaner in the past and it works really well. Considering the price, varnish seems to be a longer lasting and more cost effective method.😄

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 09:35:56 am
Kashvir
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Nattigheid op pc-board het ligte laat malfunction  

Ek het nooit daarvan geweet nie. Ek sal daarna kyk. Dankie.

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 09:43:12 am
Kashvir
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Ek het op my kar gekry n boksie met n pc-board gekry weggesteek in die agterste bumper wat nat geword het....boksie vervang en alles was weer okay 

Ek het nooit daarvan geweet nie. Ek sal daarna kyk. Dankie.

Ek het probeer om hierdie antwoord aan jou te rig en het dit uiteindelik herhal.🤦‍♂️

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 09:47:57 am
Kashvir
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Interesting! I spray some electrical cleaner on my connections (both the trailer plug and the leads for the rearview camera). It seems to work well. Like the idea of the varnish though .....

On this point, something I have done for ages, is to drop some Wynn's for Oil on battery terminals after fitting the cables. This also prevents acid to form, but think that this won't do on the trailer plug, as it will collect dust.

There`s a special spray for the battery terminals, its around R40 or so in Midas. It comes in two colors, blue and red. I usually buy both and use the red to indicate the positive terminal and blue to indicate the negative terminal. If you remove your battery terminal you will need to recoat it using the spray. It works brilliantly.

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 09:50:59 am
Relaxed Camper
Luhman 16 Member
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Ek het nooit daarvan geweet nie. Ek sal daarna kyk. Dankie.

Ek het probeer om hierdie antwoord aan jou te rig en het dit uiteindelik herhal.🤦‍♂️

Ek sal kyk of ek foto het en plaas.....is groter as n sigaret pakie

WAARSKUWING:

Kampeer is aansteeklik en verslawend 😁
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5 days ago @ 10:08:32 am
Kashvir
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Ek sal kyk of ek foto het en plaas.....is groter as n sigaret pakie

Dit sal fantasties wees.😀

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 10:22:22 am
Relaxed Camper
Luhman 16 Member
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Kry nou nie foto nie. Supaquick het vir my ingesit. Kon boksie ook nie apart koop nie.....moes hom koop as kit met hele harnas

WAARSKUWING:

Kampeer is aansteeklik en verslawend 😁
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5 days ago @ 10:42:37 am
Kashvir
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Kry nou nie foto nie. Supaquick het vir my ingesit. Kon boksie ook nie apart koop nie.....moes hom koop as kit met hele harnas

Dis duur. In plaas daarvan om jou hare te sny, sal hulle jou kop vervang. Dit is `n kit.😂🤣. Maar ek sal hulle dalk moet besoek in plaas van `n motorelektrisien. Supa Quick sal beter kennis he.

How many days we live is not important ... what's important is how much we live in those days
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5 days ago @ 23:08:04 pm
Kashvir
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Thanks to the advice from relaxed camper I have found the box module and it is faulty. So it's just a matter of replacing it. I'm glad that I was able to get help on this forum as the problem was really baffling me. I really appreciate each and everyone's response, thanks a million guys.💯⭐

How many days we live is not important ... what's important is how much we live in those days
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2 days ago @ 17:20:54 pm
Duncan
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New plugs, soldered wire tips, good to go.

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3 hours ago
Kashvir
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I have called the supplier /manufacturer of my Trailer Interface Module which are Matla Ventures and spoke to a guy named Neels. They based in Boksburg and they have agreed to courier a new device with the harness down to Durban. The device including delivery cost me just R1237. The device is waterproof. Once I receive the unit I will have it installed and post an update.

How many days we live is not important ... what's important is how much we live in those days
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3 hours ago
Kashvir
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New plugs, soldered wire tips, good to go.

Yes I will also purchase new male and female tow hitch sockets. Rather make certain that everything is renewed at once.😄💯

How many days we live is not important ... what's important is how much we live in those days
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