Okay So i installed 3 car packs into my game (DLC File) and ELS is only operating with cars in the default slots. I followed the readmes correctly and even double checked to make sure. 

Did u place the .xml file(s) in the ELS folder? 

9 hours ago, DeNeppeMilan said:

Did u place the .xml file(s) in the ELS folder? 

Yes I did

Please post your ELS.log You find it in the main GTA-Folder

is the name exactly the same as the files u put into the vehicles.rpf? excluding the _hi / +hi
The name in the ELS folder should be all capital too.

Example:

Replacement for sheriff vehicle with ELS

(Vehicles.rpf directory): 

sherrif.yft

sherrif_hi.yft

sherrif.ytd

(ELS directory):

SHERRIF.xml

On 5/4/2019 at 7:52 AM, DeNeppeMilan said:

is the name exactly the same as the files u put into the vehicles.rpf? excluding the _hi / +hi
The name in the ELS folder should be all capital too.

Example:

Replacement for sheriff vehicle with ELS

(Vehicles.rpf directory): 

sherrif.yft

sherrif_hi.yft

sherrif.ytd

(ELS directory):

SHERRIF.xml

I did and i am sorry for the late reply

Post your ELS.log (main GTA V directory) and your ELS folder here

Maybe rabbit or me can make sense out of it

On 5/4/2019 at 7:52 AM, DeNeppeMilan said:

is the name exactly the same as the files u put into the vehicles.rpf? excluding the _hi / +hi
The name in the ELS folder should be all capital too.

Example:

Replacement for sheriff vehicle with ELS

(Vehicles.rpf directory): 

sherrif.yft

sherrif_hi.yft

sherrif.ytd

(ELS directory):

SHERRIF.xml

Well first of all Sheriff is spelled wrong so double check your spellings in game.

On 5/17/2019 at 5:08 PM, pcGAMEZguy said:

Well first of all Sheriff is spelled wrong so double check your spellings in game.

Right. This happened to me before. And now I sometimes still write it wrong. But you get the point

Sorry for the very late response, I managed to figure out the problem. I had to put the Add-on XMLs in the "pack_default" folder as well.