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Well now I am going to add a little more to the mix. I intentionally drained my battery down to 11.5 volts by leaving the emergency flashers on yesterday while at work. They blinked for about 3-4 hours. Battery was at a solid 12.9 volts prior. When I took off from work the headlights were bright. As I pulled up to a stop sign the normal dimming would occur and then when I took off again they were all bright.
So why would the A/C headlights, tail light, and dash lights be affected by the amount of DC amps drawn through the system? Yesterday was the first time in a while I was able to maintain bright headlights and dash lights all the way home without fail. I am assuming the same about my tail light, but I'm not quite dumb enough to turn around and look at it while cruising down the road at 45mph.
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