My 2003 Honda Civic EX is experiencing an issue which causes the battery (alternator/charging system) light to occasionally come on for less than a second.
The car starts, runs, and drives fine without any noticeable dimming of lights or odd noises when the battery light flashes. All fuse boxes have been checked and no fuses are blown, damaged, or disconnected.
The voltage for the car once warmed up is roughly:
- 14.5V when idling (no headlights radio AC or blower fan)
- 12.15V when idling immediately after headlights, radio, AC, and blower fan are turned on
- 13.2V when car is shut off after running for a while (key in off position no lights etc.)
These measurements were taken on both the battery itself and the terminal connections and were consistent; there is no visible battery corrosion.
I have read several similar questions on this site; however, none of those situations seems to be quite what I am experiencing with this car.
This to me is the odd part. The battery light seems to come on when the lights and other accessories are OFF especially when the gas pedal is lightly tapped multiple times, it will flash each time; driving with the headlights ON and fan blowing the light rarely, if ever, seems to appear.
All belts are tightened to the point where they do not squeal or noticeably slip. One wire of the four wires in the harness for the alternator was broken and attached via solder; however, there is no resistance from the solder bead to the harness terminal which connects to alternator.
I would assume that theses momentary flashes of the battery light indicate something which is likely to be potentially hazardous to the longevity of the battery or alternator/charging system.
What is the best strategy to diagnose the problem I am experiencing?