My dodge was working great until the two belts were changed. Right after the car had to jump started and it started for two days. After that it would not jump start. I finally took it to a mechanic who informed me it was the security system and maybe a short. He fixed it and two days later out of nowhere while idling it just turned off and wouldnt crank. I dont know what to do. Also for some reason everything that runs of the fuse associated with my rear tail lights does not work but did prior to being taken to the mechanic. Help please