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There is obviously have a drain on the battery. You have a faulty break light pedal switch causing the lights to stay on, or your turn signal switch is bad. your brake lights run through, the turn signal switch too. That could also cause the problem.
You need to check the plug that goes into the alternator to see if it's tight fitting next the brushes inside the alternator have a wear indicator that is a hole in the center it is also used to set them in place with a pin that could be the flickering cause the brushes are solid till they get to the opening so when the alternator is running there's always a break in contact because of the hole so it makes and breaks contact causing the flickering and the charging level is ok but when a lot of accessories are on it can't keep up the charging voltages so the battery gradually goes dead losing power also another spot to look is the power distribution box cable it co u ld be loose and dirty and corroded
The alternator is starting to go out interminly the battery light has nothing to do with the battery being good or bad, the light is letting you know the the alternator is not putting out voltage, only when the light is on.Go to any auto parts place and they will do a free alternator test, but if the light is off more then likely it will pass the test, it needs to be tested when light is on.
Break light is no joke have the brake system checked for internal and external leaks . If none are found then itspossibly the brake hand / foot switch.
Battery lite could be incorrect battery or alternator is defective or the wiring behind alternator is corroded and lastly voltage regulator may be defective.
Thats a guessing game, but first, if the battery light was on, that means no alternator output. So recharge the batteries and be sure they are good, Then replace the alternator. If the batteries and the alt are good, and the battery light is off, then all should be OK.
The charging problem should be fixed first, pursue the other alarms later if they still exist.
You probably have worn alternator brushes, causing the intermittent 'BAT' warning indicator.
Get the alternator re-checked,
- ensure alternator and battery grounding connections are all ok.
(The battery terminal voltage should be approx 14.5v with the engine running with a load such as headlights on or heater blower motor running).
First off - 125K mi is nothing on that car (as long as you maintain it). The alternator is actually also the voltage regulator and this aspect of the alternator frequently fails before the actual alternator itself does and causes irregular voltage - so it makes sense you drove without the battery connected but you probably were having irregular power instead of a nice steady 14V (the other thing to know is that even if they do show 14V all the time the amperage may differ, both problems = change the alternator).
Sounds like part of a wiring harness is shorting to ground or breaking a ground connection. Check engine to frame ground straps and engine compartment wiring. Look for loose or broken leads esp. alternator and battery wires. Perhaps the power lead to the computer is faulty causing the truck to misfire. Any engine codes?
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