I have 2005 f150 trailer lights on left have no power i dont know wich fuse is for tow left

The fuses for the trailer tow adapter are in the normal fuse panels.

Engine Compartment fuse panel
101 - Is the battery charge circuit ( hot in run position )
20 - Left Stop / Turn fuse
19 - Right Stop / Turn
5 - Trailer tow reversing lamps & Trailer Tow parking lamps

Cab Fuse Panel
23 - fuse for the relay for the trailer tow battery charge circuit

All of these are in the owners manual

If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Check the fuse for the trailer tow parking lamps, this is engine compartment fuse # 5, 20A
The other thing to check is the trailer tow parking lamp relay.

A 1998 has the engine mini fuse panel installed, but it is not documented in your owners manual. Don't know why this is.

You would want to open the engine mini fuse panel, and check the 20A fuse.
This is a picture with the relays documented, as this is not covered in either the 1997 or 1998 owners manual.


Chances are the fuse supplying power to the L & R trailer tow stop / turn relays is blown. Common source for this problem, but could also be the relays ( possible but not probable that both went at the same time ).

You can download the 1997 Owners manual and get the page that has the engine mini fuse panel picture and info.
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Not sure which fuse you checked.
The Engine Compartment Fuse Panel ( Battery Junction Box / BJB ) is where the fuse is for the trailer tow adapter parking lamps.
Fuse # 5 is the fuse for the parking lamps, and the reversing lamps.

Next is the trailer tow adapter park lamp relay. This is what BJB Fuse #5 feeds, and the coil is operated by the truck's parking lamps. This is also in the BJB, Relay 201, it is the 1/2 size relay.

Not sure what you took a resistance reading from on the trailer tow adapter.

If you want, you can pull the trailer tow park lamp relay, and jumper the normally open contacts, which should provide power at the trailer tow adapters, regardless of the truck's lights.


This is the wiring diagram for the trailer tow park lamps

There are a few fuses for the trailer tow adapter.

1st, is theodd location on the 97-98, engine mini fuse panel has a 20 A fuse forthe stop / turn lamps. Have seen it covered in tape from the factory onsome 97-98 MY trucks.
This is on page 142 in the owners 1997 manual, all the revisions for the 1998 owners manual I have seen do not include this fuse box for some reason.

Download a PDF version from Ford, for the 1997 MY at :

https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

This is a picture of the Power Distribution Box, additional relay box and engine mini fuse panel with the covers off. The 20A in the upper right panel with the red base, is the trailer stop/turn fuse.


The others :
1. Power Distribution Panel / engine compartment fuse panel
Fuse #1 - Trailer tow back-up and tail lamps
Fuse #16 - Trailer tow battery charge and stop/turn lamps
Fuse #28 - Trailer tow electronic brake

2. Instrument Panel Fuses ( cab fuse panel by hood release )
#23 - trailer tow battery charge relay

The rear lights :

Brown is the parking lamps ( either side )

Driver's side Stop / Turn : Light green w/ White stripe wire
Pass Side Stop / Turn : White w/ Light blue stripe wire

Another option ( for use with the factory trailer circuits ) is to add / replace the factory tow adapter. eTrailer has them, if you are interested. This is the type adapter as Ford p/n: YL3Z-13A576-G. You would need to install the relay and the fuses for the trailer circuits if you do this.

Trailer Tow reversing relay ( non serviceable ) and the Trailer tow parking lamp relay are both fed from Fuse #10 ( coil on reversing relay is fed from reverse lamps & coil on parking lamp relay is fed from the parking lamps ).

Trailer Tow battery charge relay is fed from Fuse #106 ( coil is fed by fuse #13, hot in start / run position from key ).

Right Stop / Turn is fed from Fuse #36 ( powered from MFS circuit for truck stop/turn )
Left Stop / Turn is fed from Fuse #42 ( powered from MFS circuit for truck stop/turn )

Parking lamp is

If this is a factory light harness for the trailer hookup on your Caravan. Look under the hood for a fuse box. Many 2000+ vehicles have this with separate fuses just for the trailer lights.

Check with http://www.etrailer.com/faq-wiring.aspx. They may have the fuse location. I know some are behind the passengers kick panel. Hope this helps. Mike