2004 Chevrolet Blazer electrical issue while running.

5

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

64,465

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.

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