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Battery and Brake Light flicker on and off

1.9K views 8 replies 8 participants last post by  shadow_FIX  
#1 ·
Im not too big on wiring and electric but i was wondering if anyone knew how i can fix this problem. The light for the E brake and for the battery will randomly turn on and off or even flicker sometimes when i do a hard launch or brake hard or just steady driving sometimes. Its not a big deal but was wondering if anyone knew how i can get rid of it because its starting to get a little annoying.
 
#3 ·
Sean485 said:
Check your system voltage when it is idling. Those are the tell-tale signs of a dieing alternator and/or battery.
Yes, if you unplug a dying battery from a running car with symptons such as the OP's then you'll actually notice the electrical issues going away. It seems, an old dead battery causes more of a drain on the system than it can keep up with, which makes it seem as though the alternator is going.
 
#4 ·
You may also check for corrosion inside the battery cables. They wick moisture, and then corrosion hides under the insulation. If you flex the battery cables (especially the positive lead), you may see that the wire strands become frayed. Any mechanical disturbance (e.g. hard launch) can perturb the battery cable, causing less than perfect conduction path, greater resistance, less current, etc.
 
#9 ·
Boost92AWD said:
Its alot cheaper to just go and buy the alternator now and fix it. Instead of trying to see how long it will last and then the next thing you know your stuck on the side of the road, and now you have to buy a new alternator and pay a couple hundred dollar towing bill.
Until recently I never realized how expensive towing is. AAA has saved my ass on just a few occasions. ;) +1 on replacing the alternator ASAP.