Trailer lights won't work

[BigJay]

I've installed a new trailer wiring harness for my small motorcycle trailer, 4-pin. I tried connecting it to the factory 4-pin receptacle and a 7-pin adapter. Neither activate the lights on the trailer. Any suggestions?

 

[Bedrck47]

Is the first time you hooked up a trailer

Also it helps to know the year of your expy

 

[BigJay]

Thanks; no, I've towed many times w/my 2010 Expy

 

[BigJay]

all trailer bulbs r ok

 

[Bedrck47]

When you towed before did you use the 7 pin or the 4 pin connector

 

[Bedrck47]

Make sure you have a solid ground connection or the motorcycle trailer

 

[BigJay]

7 pin; I think the ground is solid

 

[Bedrck47]

If your factory 7 pin worked correctly then the factory 4 pin should also be correct

I would suspect a bad ground or a mis-wired connector on the trailer

Can you read and understand wiring diagrams

Also do you have a volt meter

 

[BigJay]

i can, I'm an engineer; my electrician buddy is bringing his meter.

thanks

 

[Bedrck47]

prints for the 2010 attached

Let me know how you make out

 

[BigJay]

great thanks; will do!

 

[Plati]

My LoadRite snowmobile trailer lights stop working or do strange things every few years. Its ALWAYS the ground path from trailer to vehicle. (You might have some other problem) The lights are grounded to the aluminum frame and I have to make sure there is a solid connection from trailer frame to the ground pin on the vehicle connector. Voltmeter/ohmmeter is the tool to find out what the problem is. I put dielectric grease on the pins twice a year due to salt in my area.

 

[Russell Lewis]

i can, I'm an engineer; my electrician buddy is bringing his meter.

thanks

This is a must lol
You put the probe to each pin to mak sure getting power. If no voltmeter you can use a test light but cheap ones like $10