Loose 7 pin plug

We found our 7 pin plugs core had worn loose, the screw that holds the insulator block had wallowed out its hole and allowed the insulator block to move forward and not contact the trailer connector.

I used gorilla glue to glue it back in place, worked well after that.

Take male end and bend the metal tabs inward slightly. This will get them to make better contact.

troubledwaters wrote:
Looks like it's at least 10 years old, maybe replacing it is a more permanent answer.

X2
Jury rigging is never a good solution.

Looks like it's at least 10 years old, maybe replacing it is a more permanent answer.

For a temporary fix, do a wrap or two (pulled tight) around the "male" plug with a good quality electrical tape. You may add or lessen the number of wraps until proper fit!! memtb

The answer is yes, but, with reservations. Like most electrical plugs, the contacts are basically one or two springs, in this case the spring is a flat piece of meter that is slightly bent, a usually solid stiff piece of metal is pushed between the two springs and allow power to flow.

Take the offending socket or plug apart and using a small screwdriver, bent the springs slightly back so they touch the solid blades again.

There are two basic things that cause the looseness, heat from current flow and vibrations. The metal springs loose their temper and while you can make them work again, the metal is fatigued and will become loose again. Sometime you'll need to replace the socket or the plug, so keep a spare and do the whole job when you get a chance.

My contacts sometimes get a little dirty I guess... I usually squirt some WD40 into the contact area and then hookup the 7-way cable moving it around before locking in place with the spring loaded lid... this keeps the contacts and blades clean for me...

Once locked in place with the spring loaded lid it is pretty tight on my setup...

Some folks don't like using WD40 on the contacts but I always have a can on-board along with a roll of duck tape haha... Use what you gots...

Take a look at your spring loaded lid and tabs to make sure they are indeed in place... Maybe one has some damage to it...

I have also seen one RV'er was using a short stretch rope around his cord and tied off to the truck bumper frame...

I also turn on the Truck running light and flashers and do a walk-around when first hooking up to make sure all DOT safety lights are working...

Roy Ken

Not the best answer, but we used to have one on a boat trailer that was loose. As a quick fix we used a hair "scrunchy" to hold it in the socket tighter. It became the long term solution. When it lost it's stretch, just replaced it with a tighter one.

Is it loose with more than one trailer plug? Is your spring loaded cover not securing your male connector to the jack? Is the problem on the male or the female part? That should be your first determination.