I have a 97 Chevy Blazer 4x4 with a little over 113K miles. I've been having problems with the voltage for a while now. The voltage gauge swings from 14v to about 10.5v when I stop at a traffic light or a stop sign. I'm convinced the gauge is not to blame because when I put a load on it, it indicates 10 to 10.5v, the Dash lights dim, the headlights will also dim. I've already replaced (3) alternators on this Truck (2) batteries within (4) months and everything is still the same. The gauge will read just above 14v and sometimes even 16.2v while am driving the truck with no problem but the minute I stop at a traffic light the Voltage Gauge drops down to 10v or 10.5v depending on what accessories am runnning on my truck. The truck starts up good and the Voltage reads a perfect 16.2v but the minute the truck is warmed up the Voltage then starts to drop to about 11.5v then to 10.5v and then to10v Depending on what accessories is running on the Truck. Temperature and frequency between trips seems to not make a difference either. The only thing I have done to the truck even remotely connected to the electrical system is to swap the radio, but I used a wire harness to connect the wiring. I've already checked for loose wires or bad grounds and their is none. I've even had a addtional grounding wires installed but that did not help either. Other than I'm lost. Any help?
- posted
18 years ago