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Re: brake lights failing
Both issues would seem to be a loose/corroded connection and most probably the grounding. The brake light is part of the taillight. Most taillights operate with dual filament bulb (3 terminal). The metal
body of the bulb bottom is usually connected to the body ground. The
correct procedure would be to trace the wiring harness from the
taillight and determine which is the ground and verify that the
contacts are clean and free of corrosion. An alternative is to add a
grounding wire from said metal body of the taillight bulb and attached
to any bare metal/chassis/body in the rear. The same loose ground could cause the inconsistent battery indicator.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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When you release the brake pedal, there is a switch underneath the brake pedal that disconnects the circuit to your brake lights causing your brake lights to switch off. Sometimes this brake light switch will go bad and need replacement. If your brake light stays on after you turn your car or truck off and you don't want to run your battery down, you may be able to get down underneath the brake pedal and manually pull up on the brake light switch to deactivate it until you can get it repaired. and i think you can make a diagnostic by yourself and the Autel MaxiDAS DS708can help you
Almost certainly the brake light switch has failed, it's located just above the brake pedal. It's a small box unit with a plunger type switch. Get down into the footwell, and see if u can push the plunger in and out a few times, it might just be stuck. U can try given it a really (I MEAN REALLY LIGHT) light smearing of grease to help prevent it from sticking.
If you find the above cures it, then cool, might aswell buy a new brake light switch as they are only £8 or so from VW, and u can easily fit it within 5mins yourself.
Are the brake lights staying on with your foot off the pedal? If yes, check the brake switch above the brake pedal for a failed closed condition. Problem could also be in the brake light relay. These are likely places to look.
Not even the third eye? then the fuse is blown or all the bulbs are out or the brake light switch on the break pedal is bad wire off or broken( it breaks right off the plug then crosses then blows the fuse as the loose broken wire hits the brake pedel arm. Test the break pedal switch first if the third eye doesesnt work either. no power with a test light the fuse is blown or the wire broke ( the wire goes straight to the switch from the fuse and doesnt go anywhere elese. the other wire if hot should light the lights. Most of these wont come out of park without this working as the wire also turns on the park release but some Fords the park release sticks released and Ford made em that way as they didnt like the brake to get out of park law. If the brake lights dont work maybe you ought not be able to get out of park anyway till its fixed. the switch is hot on both wires with the switch pused down and the lights dont still work go after the third eye first if the bulbs are bad change em before you do the rest of the work. on cars with yellow turn signals the brake lights all work on the same wire but red only use three wires, but you didnt say the turn signales didnt work if they work and they are red you r on the way to the turn signal switch as the brake switch powers the turn switch with power then it splites it fot the two lights and adifferent switch circuit for the front hooks them all together for hazard. yellow turns in the back or even separt bulbs can mean blown bulbs ther too its old enought for all the bulbs to fail and the runs still work.
your brake lights are on a live switch , they will go on when the key is off. so if they are on, your battery will eventually go dead.
now on the pedal there is a switch so when you push the brake the light is activated and so is the actual brake. Check and make sure it is still near the pedal top and can be activated with the pedal down .some are reverse switched down is not making contact and so is tripped and others is brake pedal arm is down toching the button depressing it and making contact. contact your local parts store see what parts they have for your make and model. DONT BUY anything. just see how you switch is suppose to work then you'll know how to test it. if your not sure even call them or any parts store and ask how to test them . they love to share information. which makes them even more valued. Your Cruise wont work because of your brake switch deal. it thinks that you on the brake. Good thing too. Going down the highway cruise on....tap brakes and cruise keeps right on going. that would be very bad. Nothing to do with the battery. just that its a casuality of the brake issue.