Jump to content

truck died and won't stay running

Smeastman
 Share

Recommended Posts

Smeastman Enthusiast

Smeastman

Posted
Posted (edited)

2019 Sierra sle 5.3

Saturday morning I pushed the start button on my truck and it just went "click", sounded like the starter engaged but not enough battery to turn over, I was in a hurry to get to an auction to ironically bid on a car hauler so I grabbed a different vehicle. Got out bid on the trailer, came home through a jump pack on the battery left it for about 20 minuets, truck started all seemed good, no warning lights no other symptoms. I drove down to a local pizza joint to pick up some wings and pizza out of habit turned the truck off when I got there, when I went to leave push button and "click". a guy I knew was there, tried to jump the truck, same thing "click", called wife, she came down with my good cables put them on for about 15 min and the truck pops off, down the road we go, about 1/2 mile from home dic says "service charging system, truck may stall" and it did. jumped it again, it stalls about 20 feet down the road, towed it home. Voltage on the battery measured 12.4vdc and stayed the same when I pushed the start button, put it on the charger at 50A for 30 min battery measured 13.6vdc, truck starts all looks normal. while its running I start to measure voltages, at the battery I measure 14.0vdc, at the alternator I measure 14vdc, from all points on the power distribution center on top the battery I measure 14.0vdc, about 20 min in it dies again. replace battery with fully charged battery, same story. Any suggestions?

 

sorry so long.        

Edited by Smeastman
Bikerjon Enthusiast

Bikerjon

Posted
Posted

I would check the alternator output. Load it with a charging system tester and measure amperage output or take it to a mechanic who has a charging system tester.

Transient Senior Enthusiast

Transient

Posted
Posted

Iirc, autozone is able to test alternators.  Other auto parts stores might be able to, too.  Might be worth calling a few in your area to see if they can test your alternator should you take it to them.  

  • 2 weeks later...
Smeastman Enthusiast

Smeastman

Posted
  • Author
Posted

Up Date; after much digging and troubleshooting found the problem. the wiring harness to the ECM was wore through and the main power wire to the ECM was broke. I'm not sure how the truck was starting with a jump or fully charged battery the few times it did but after repairing the wire it starts and acts just like its support to.

Mshawn Enthusiast

Mshawn

Posted
Posted
On 10/16/2023 at 2:29 PM, Smeastman said:

Up Date; after much digging and troubleshooting found the problem. the wiring harness to the ECM was wore through and the main power wire to the ECM was broke. I'm not sure how the truck was starting with a jump or fully charged battery the few times it did but after repairing the wire it starts and acts just like its support to.

Where was the harness problem located at in the engine bay? I’ve noticed there has been more than a few problems with wiring harness chaffing 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • revmanii
      Starting a new thread regarding mounting my 2014 OEM wheels to my 2026

      By revmanii · Posted

      The BORA 3/8" spacers arrived yesterday along with the extended lug nuts. I got the front wheels changed out today, but was overheated and covered in sweat so bad, I figured getting both front wheels done was a win, and took a cool shower. Hopefully, I'll go out tomorrow morning before it gets into the 80+ temps and do the backs. After getting the first wheel snugged up, I backed out one of the lug nuts then hand turned to count threads. I believe I stopped counting around 12-13, so I think I'm good there.    
    • Atlas
      2027 GMC Sierra: Official Discussion

      By Atlas · Posted

      My fullsize truck is averaging over 26mpg so I'm pretty happy with the increased fuel economy targets. When I had my gas Silverado (2020 5.3) it was averaging 21. Again, for a fullsize truck, that's very different from the 12-15 these things used to get 30 years ago.   Whine all you want, increased MPG is a good thing.
    • bluev8
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By bluev8 · Posted

      That is a fair point, and I think an OBD-first proof is probably the right next step. I agree that the value is not the hardware box by itself. The marketable part would be the software: always-on capture, baseline learning, event reduction, system-specific reports, and alerts. Also agreed that if an OBD device is always plugged in and has local storage, it should not miss the event in the same way that a scanner plugged in after the fact would. The only thing I would not want to assume yet is that an ELM327-class device gives all the late-GM data needed at the rate needed. Standard OBD live data, DTCs, freeze frame, Mode 6, VIN, and calibration information are definitely the right starting point. GDS2 also proves that a lot of useful ECM data can be viewed through the DLC without needing a DTC first. The question I need to test is whether the data needed for a useful GM V8 event report is actually available through the DLC, and at a useful sample rate: - misfire counts / roughness by cylinder - AFM/DFM state - oil pressure and oil temperature - fuel trims - voltage / reset context - U-codes and communication events - calibration / software information - whether these are standard PIDs, enhanced DIDs, Mode 6 data, GDS2-only data, or not available So I think the right benchmark is: 1. Build the OBD-only version first. 2. Keep it plugged in and logging locally. 3. Compare it against GDS2 / freeze frame / HP Tuners or another higher-end logger. 4. Measure which parameters are available and at what update rate. 5. Only justify ECM-side hardware if it captures useful evidence the OBD version cannot. So you may be right: the consumer product might simply be an always-plugged-in OBD event recorder with much better reporting. A question for you: when you say ELM327 devices can already deliver all the data needed, do you mean generic OBD Mode 01 data only, or GM enhanced data as well? For a useful GM V8 report, would generic OBD data be enough, or would you expect the tool to include enhanced items like misfire by cylinder, AFM/DFM state, oil pressure/oil temp, U-codes, and calibration information?
    • Buckwild27
      Gas Prices

      By Buckwild27 · Posted

      I agree. 
    • Atlas
      Gas Prices

      By Atlas · Posted

      87 down as low as $5.14 here... winning!

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...