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Re: head lights will dim
Brake lights draw fairly hefty current; about 50W total (4 amps) so some dimming wouldn't be serious but you might want to remove and clean battery terminals at the battery and the ground (negative) cable that normally is connected to the chassis and/or the engine block.
A low-cost Chinese digital multimeter (< $20 US) would help you locate this kind of problem - and many others around home too.
You don't need to be an expert to make use of these and they all come with some kind of Chinglish instructions that sometimes even intelligible.
You can buy these at Radio Shack in the US or about any chain auto parts store.
With one of these and a helper to sit inside you can check across the battery terminals directly, then between the clamps, to ground etc. to isolate the source of the voltage drop.
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Was any of the brake light bulbs changed recently, the wrong type of bulb may be used causing a short in the socket, and making the rest of the brake and signal circuit malfunction. I no bulbs were recently replaced, start with checking for corrosion in each bulb socket, signal and brake bulb sockets. Let us know what you find
It's not high and low beam, it's the dash lights that are dim. I've hooked up many aftermarket radios but never knew it was a no no to hook up the dimmer/illumination orange wires in a '01 civic. I googled it and seen many others with similar issues like mine but nothing exactly like the issue I have.
All the dash lights work, they are dim though. The radio lights work but they are even more dim than the rest of the dash lights. I have check every single fuse under the dash and in the engine bay. The dim controller does not work at all now. I'm guessing that's the issue and from what I read, the dimmers circuit board is in the instrument cluster. Some can fix it, others can't.
I will probably end up buying a used instrument cluster off of ebay, they are not expensive. Hopefully that fixes it since everything else works.
Oh, yes, the brake lights work.
Ted, I think you answered the wrong question...I mentioned nothing about the battery or the low/hi beams
Sounds like you have 'ground' issues. Apply the brakes using a broom stick or more apropriate tool so that the brake lights are activated. Then go to the brake light that is not bright enough. using a test-light with a sharp pointed probe, poke the ground wire close to the bulb (usually a black wire) make sure the test light is attached to a grounded bolt. if the brake light gets brighter with ground added, you need a new ground wire. Splice it in to the existing wire & attach it to a bolt. Lights should work better with proper ground. (each bulb has a positive post & neg. post, don't add ground to the side with power coming through it from Battery (+)(red light on test light) - probe wires FIRST with test light to find (+) POS. Hot wire, and leave that one alone.
Hello and welcome to FixYa! You may want to start on adding a body ground. You may be lacking body ground that's why the lights dim when you hit the brakes. Hope this helps and thank you for using FixYa! Have a good one!