Parking Light with Jumper

The trailer charge circuit is not hooked to battery or blown fuse in charge circuit line on trailer.

The center pin of the trailer connector should be for back up lights. the purple wire in the trailer cord should power your docking lights.
Need to query what you are calling parking light?

Since they worked when plugged into your truck, I'd say there was some problem with the jumper you made.

you sure you are jumping the correct 2 terminals? Red and Brown on this diagram should be jumped

Moderator edit to re-size picture to forum recommended limit of 640px maximum width.

Look at the diagram above. The red wire on your trailer is not passing electricity from your trailer battery. Or the negative wire is not letting the electricity back into the battery.

1. If you have a disconnect switch make sure it is allowing power through the switch. You can check by turning on an interior light
2. The trailer battery is dead. Verify by turning on an interior light
3. The trailer battery negative wire is not hooked to a good clean bare spot on the trailer frame
4. Less likely, your truck and trailer wiring are not standard and you are just using the wrong terminals

Do you have a multimeter or a 12 volt test light?

Why are you looking to power the running lights on the trailer?

I am still waiting for somewhat of the same answer, Philh.
He started asking about "Parking lights". Parking light term hasn't been used in years!
Other posters read it as tail lights and clearance lights from their posts.
Maybe he is one of those RVs that likes to llight up the campground!

Some people think it looks cool. Its not for me but if someone else wants to do it thats fine by me unless the rear of their trailer is 10 feet from my campfire or they leave them on all night. I would much rather see a red glow than these people that leave their scare lights on all night on both sides of the trailer lighting up the whole campground

enblethen wrote:
I am still waiting for somewhat of the same answer, Philh.
He started asking about "Parking lights". Parking light term hasn't been used in years!
Other posters read it as tail lights and clearance lights from their posts.
Maybe he is one of those RVs that likes to llight up the campground!

Parking lights are the same as tail and running lights which are the same as side markers and taillights. We can each call them something different, but they are the same.Ultimately the OP wants his trailer to look like the tow vehicle headlights are on and he is not stepping on the brakes. So his markers on the top are illuminated as well as the license plate light and taillights (not brake lights

Is he "One of those RV's that lights to light up the campground!" Well he is apparently a camper who likes to turn on his (parking, running, tail, side marker) lights while he is camping. In over 20 years camping I think I've only ever seen one camper disconnected from the tow vehicle with the running lights on.

I follow what he wants! Saying parking lights is wrong terminology. They are clearance and tail lights.
I have seen many rigs all lit up. One I really "enjoy" are the ones that install a flasher instead of a jumper.