stupid car ARRRRRRRRRRR help please

yesterday i started to fit a new stereo to my car, but when i plugged in the wires into the stereo it came on then went off again. So tonight i started to case back the wires from the connector's to see if i could run new wires as i thought they were faulty. As i found this to be very  awkward i took out a part of the dash out where the switches and the heater dials are just to give me a little more room.
Not being able to figure it out and being awkward trying to do it on my own i put all the dash back together.
Now when i turn the ignition on the battery and oil light comes on but the battery goes dim i now have no indicators no heater and the car will not even turn over. i do have side lights but are very dim but if i put lights on dipped beam every thing goes off  :bang head: at one point the hazard lights worked but started to get faster then go off also one of the relays makes a funny noise as if its dying HELP i am at dead end and don't know what to do  :dontknow: the frustrating thing is that i have not done anything that i think could have caused this much aggro  :cry: anything would be a help as i have no idea about electrics cheers Simon

are all the stereo wires covered, might be an ignition 12v supply going to earth, what voltage is your battery
until someone better comes along

no stereo wires not covered. and am presuming the battery is 12v. The thing is the car started and run great until tonight  

can you check the voltage on your battery? is the car starting now?

Im assuming when you press the on button on the stero it lights up then after about a second or two it goes off.  If this is the case you have your 12v and your ignition 12v wire the wrong way round,or connected on the wrong pin.  Spent about a day having the same problem and ive ftted lots and lots of steros just a brain fart at the time lol

To sort out the rest i would carfully remove what you took out before and inspect the wires and connections carfully, had all mine working as it was hanging loose, and when i put everything in, had near enough the same issue, check you have 12 v at the ignition switch, I assume you have volt meter, if not defo worth getting one and getting shown how to use it, well just the basics anyhow, ie voltage.

0b1dhobi PMd you mate