RoyB wrote:
I got one of these 7-way testers from AMAZON... You plug this in place of the trailer plug and if all of the lights work good here then the problem is on the trailer side...
I also squirt wd40 into the connector at times and wiggle the 7-way plug around some to clear away some of the debris...
Roy Ken
I agree with this post. It tells you in an instant which side of the electrical connection the problem is on, eliminating half of the possibilities in an instant.
Only, I prefer
This 7pin/4pin Tester since it also tests a 4 pin connection.
