amp ground wire problem
 

i was installing subs in my car
everything was goin fine
untill i try to ground the black wire, which runs from
amp to ground location
the other end of the ground wire which connects
to the amp was un-hooked and once the grounding
was complete i hooked the wire into the amp

as i was hooking the ground wire into the amp
there were big sparks at the ground location
it surely didnt look normal to me, as i have never seen
such big sparks while connecting ground wire to the amp
then i checked and both the amp fuses were blown

am i doing something wrong here?
wat could be the reason behind blown fusues and big sparks?
plz help!

big amps and big subs require steady amperage and good ground, You should hook up the ground first and then the Hot lead. and the entire system should be shut off.

oh ok
btw is it ok to use washer and nut to secure the ground connection
anywhere on the metal within the car?
also i didnt unhook the terminal while i was installing subs....

this time i will unhook the positive terminal
and secure the ground connection first
then secure the red hot wire
and then hook the terminal back.....
are those steps ok?

Make sure your ground is good before hooking it up to the amp. Get some sand paper and sand the area where your ground wire hooks up to be sure it is a good connection. i also recommend checking it with a volt meter to be sure it is good. other than that your steps are fine. and yes a washer and nut will work fine.

It doesnt matter whether to install the positive or negative first. You should always disconnect the negative post on your batter when installing amps.

Actually it can matter, connecting it while it's hot. I'm just being honest, it's a recommended action to disconnect battery power to the amp while making connections to the amp(s) or distribution block, or capacitor(s), and charge them up accordingly. Reason being that connecting it while it has power by the red(positive) wire first can induce a load through the audio cables, even if the amplifier is off, because some amp's internal capacitors must charge to the load and will charge from the closest thing there is to a ground. So always do power before audio cables too:). Secondly I wouldn't recommend connecting audio cables if they are anywhere close to another amplifier's power cables, any contact can screw the amp's ground isolation circuitry or the head unit's amp. LOL