Hi i have a 2003 blazer xtreme and it starts and runs but whenever it feels like it it just shuts down i lose everything no fuel pump no starter click no lights have to get towed sits for a day or 2 and starts back up any help would b appreciated dont even know where to start computer or fusebox or is there something else plz help

 

First thing is to check for error codes.

Then check electrical grounds perhaps since you described the whole truck shutting down.

What is the condition of the battery? What about the alternator? Is it charging properly?

 

Had battery and alternator tested both tested good when try to scan it for error codes it dont read at all have checked all ground locationd that i can find thats why idk where to start cant get no code scanner to read anything

 

With sudden cutouts it may not even record any codes. For the ECU it's like the key has been turned to "off".

Christine's advice is sound.

Battery
Connections (including grounds)

What comes to mind in addition:

Theft protection or alarm
Ignition switch


I'm moving the thread to the lighting & electrical section.

 

Theres no alarm system on it and it could b the ignition switch even tho it starts it i can try to replace it this weekend can try to post results thanks for the help

 

Been trying to find a wire harness diagram was gonna cut out the harness and rebuild it i work at wire place with all the wire and terminals i need but dont know where everything plugs in and hooks up at

 

Welcome aboard, good luck with the repair.

and hello from a fellow icp fan lol

 

Dont cut up your wiring harness. Check for loose connections perhaps main cables in the inst cluster. I read where one issue was loose solder points on the cluster itself. I just resolved my starting issue with a new dist cap after trying fuel test and new battery. Cheapest parts fixed my issue. See coil wire is loose and if cap has any moisture in it clean it with stsrting or electrical connection cleaner and scrape off any carbon build up or replace all together

 

Thx whoop whoop

 

Have been looking for loose connections and havent been able to find any yet was thinking bout trying dist cap but it starts and runs fine till cuts out so figured dist cap was ok same with the ignition but thanks for the advice doing wire harness was gonna b last option