Speakers not working ram 1500 1997 infinity

[Sem168]

Hello,

I have a problem with the speakers of my truck.
The left right door and rear speakers are not working. Only the tweeters in the left right doors are working.
Ive tested the left door speaker by connecting the speaker wire with the tweeter wire and it still works so the speakers arent blown.
I have an aftermarket stereo that ive connected the wires to from the radio hole with the diagram below.

Does anyone have an idea whats causing trouble?

Thank you in advance.

Sem

 

[Hanover Fiste]

Did they just quit working, or have they never worked?

 

[Sem168]

From when i bought it they havent worked. About 6 months ago.