2004 Chevrolet Blazer electrical issue while running.

5

Asked by Jul 14, 2015 at 10:18 PM about the 2004 Chevrolet Blazer LS 2-Door 4WD

Question type: Maintenance & Repair

Lately I have been having electrical issues while driving. The issue is that while driving
down the road the volt meter will drop below the 14 volt mark and further when I turn on the
AC. When I apply the breaks and put it into reverse it will drop even further when I go to
back into my driveway, by this time it will have dropped down almost around the 9 volt
mark.

I have replaced my neutral safety/backup light switch, battery, and alternator. The issue
was there before I replaced the items. The neutral safety/backup light switch was replaced
because the locking mechanism to shift would not work sometimes, and my backup lights
would not come on unless I put it in park first. The battery and alternator were replaced
about 6 months ago because they were both bad.

I have worked on many vehicles but with this issue I have no clue where to start. I would
greatly appreciate any recommendations. Thank you in advance.

2 Answers

70,045

Two issue,s will cause this beside,s bad wiring,There is and issue with the ignition switch,or your ECM is bad,all so check your body to frame ground.

5

Update with this one. I recently started getting the P0449 (Evaporative Emission System Vent Valve/Solenoid Circuit) check engine light code and twice I have received a crank position sensor fault. Other than that I went back and checked my battery and alternator, My battery needed charged, it was at 50% charge, and my alternator's bearings were bad. So I still have the issue but dwindled it down, there is the normal draw with the AC ,but it only really drops as soon as I go and put it in reverse.

Your Answer

Chevrolet Blazer Experts

  • #1
    Andrew Olsen
    Reputation
    2,110
  • #2
    yetilikesbeer
    Reputation
    1,400
  • #3
    Rowefast
    Reputation
    1,080
View All

Related Models For Sale

Used Chevrolet TrailBlazer
40 Great Deals out of 4,277 listings starting at $1,500
Used Chevrolet Tahoe
828 Great Deals out of 41,817 listings starting at $1,995
Used Chevrolet S-10
15 Great Deals out of 1,235 listings starting at $1,000
Used Chevrolet Silverado 1500
2,612 Great Deals out of 174,524 listings starting at $1,000
Used GMC Jimmy
193 listings starting at $2,500
Used Ford Explorer
1,204 Great Deals out of 69,242 listings starting at $1,000
Used Chevrolet Colorado
340 Great Deals out of 37,552 listings starting at $1,995
Used Ford F-150
3,155 Great Deals out of 219,406 listings starting at $700
Used GMC Yukon
606 Great Deals out of 20,972 listings starting at $2,695
Used Chevrolet Suburban
489 Great Deals out of 24,107 listings starting at $1,799
Used Toyota 4Runner
348 Great Deals out of 26,295 listings starting at $1,800
Used Jeep Grand Cherokee
1,053 Great Deals out of 72,063 listings starting at $1,195

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.