I noticed that the system voltage was a little low when I started the car to head home last night. When I turned on my lights and fan it was riding on the edge of the red zone on the voltmeter. I made it home but the lights were getting pretty dim. I charged that battery overnight and when I started it the voltmeter went well up towards the red zone on the other end of the scale.
The battery light comes on with the key on, engine off. Nearly 0 ohms (cheap DVM) between the alternator case and the intake manifold. After charging, engine running, the voltage measured at the battery was 14.7V. Turning on the lights and fan dropped it to 12.4V. Specific gravity was low across the board and more 50 points between cells. Not great, but not exactly fatal either.
My question is - Will a bad battery make it so the alternator won't be able to operate the car ( yellow headlights, EGR light on, low system voltage) ?
Thanks
Greg
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