I have an 02 Taurus SEL 24 Valve. While at idle or at a stoplight all lights dim slightly and the heater fan speed slows. Once you are back on the gas and driving the lights brighten just enough to notice and the heater fan speed increases. So what's the deal bad alternator or bad battery or what? The heater fan speed increase is very obvious and is what lead me to check how the lights reacted in the same situation.
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