Forum Discussion
A 7-way and 4-way tester is part of my toolbox...
![](http://www.etrailer.com/Merchant2/graphics/00000001/pics/T/R/TR20117_500.jpg)
![](http://cdn2.bigcommerce.com/server4600/584d2/products/11143/images/10227/4_way_light_tester__50689__63699.1329501307.1280.1280.JPG)
Knowing what is happening at the source sure does speed up finding the problem and saving some monies...
My problem sometimes is just a dirty connection at the 7-way socket on the truck. I always squirt some WD40 into the socket and moving it around some before heading out. Some folks will not like the WD40 but that is what I have in truck side pocket along with a roll of duct tape haha...
Roy Ken
![](http://www.etrailer.com/Merchant2/graphics/00000001/pics/T/R/TR20117_500.jpg)
Knowing what is happening at the source sure does speed up finding the problem and saving some monies...
My problem sometimes is just a dirty connection at the 7-way socket on the truck. I always squirt some WD40 into the socket and moving it around some before heading out. Some folks will not like the WD40 but that is what I have in truck side pocket along with a roll of duct tape haha...
Roy Ken
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