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First off the battery light will stay on. It is bright red when at idle or at a stop sign. Then when i take off it will dim a bit.
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Either the voltage output is getting low, (mine did same when brushes were worn,) or the white monitoring wire on top has a bad connection (simply clean and protect). Given the voltage reads fine, likely the latter.
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Every so often the lights on my dash will just go out
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Ignition switch is bad.
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the air bag light will flash
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It's flashing out an error or diagnostic code. For instance, 5 flashes, pause, 1 flash, pause, pause, repeat pattern.
Since these problems are all intermittent, DaveEscort97's suggestion about checking ALL of the grounds is spot-on. Electronics can and will do some crazy, unpredictable things when they're low on power. Having a bad or intermittent grounds has a similar effect, except that potentially damaging static-electric discharges can between circuits.
Cars that have been exposed to flood conditions are notorious for the types of problems you're describing. It's illegal to sell those, but it inevitably happens.
Also, check and make sure that your heater core isn't leaking onto the computer beneath the center console.