I've tried searching, but seems everyone has a different solution and non of those have worked for me. Here is my problem:
Everything was fine this morning. Went to my shop to install my KYB struts, while I was at it, I cleaned off the corroded battery terminals. Test drove the car, and got gas on the way home. That was it for the use of my car for the day

Then I went to start my car a little earlier and car will not crank at all. I hear only one clicking noise as I try to turn her over and every light in my dash just goes really dim. When key is in Accessory position lights are solid and run fine, but when I try and turn ignition, everything just dies. When I let off clutch and key returns back to Accessory position lights slowly recover from dimming.

Then I try turning on the headlights and everything flickers like crazy non stop until I unhook the battery. Also during the crazy techno rave in my car, there is a constant clicking noise that goes with the flickering in the front ECU (green box in engine fuse box)

I checked all the fuses, they seemed fine, but I will double check tomorrow when it's lighter.
I tried resetting the ECU, but that only let me use the normal functions. For example: window, radio, headlights, etc. Until I try and start her up again, she just dies and lights dim badly.
I read somewhere that it could be the alarm system since I have an autostart installed. So I unplugged that, but same problem...
I haven't quite checked the grounds since it's dark outside, so I'll have to wait on that for tomorrow. I'm not sure if it could be an ignition ground or if it could be a clutch sensor.

Thanks for your inputs

 

try replacing battery with a good one just to see if the car starts, what your listing sounds like a textbook dead battery

or remove your battery terminals again and clean the inside of them as there may still be some corrosion preventing a solid connection with the battery terminal

 

battery has about 11volts currently. I'll get a terminal cleaning kit tomorrow and brush the hell out of it. Only the positive side is corroded.

 

Problem solved!
Badly damaged battery terminal clamp on the positive end. I went to Checkers Auto and purchased a new set of battery terminal clamps and battery terminal protectors.
Cleaned off the terminals so they were shiny again along with the ground clamp. Installed new terminal clamp on positive side (needed a bit of grinding and filing to get cables to fit)
Car has been starting without a hitch!

 

Glad to see you figured it out quickly.

 

Yea I was very fortunate since I had a date tonight!