loose ground cable and other electrical stuff help

[Jaydsm-]

i was lurking around under my dash because my car wont start and found this, a broken ground cable:

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Does anyone know what cable could it be?
Also if you guys can lend me a hand and help me identify these connectors/plugs that would be great (as in what connects to the plug or what plug connects to the connector)
Just about left under the dash:

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Under the steeringwheel:

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Also can I remove this?Its old rusted and infested with bugs I think .. looks like a amplifier:

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Thanks guys
PS: the reason my car is stripped is because Im cleaning the carpet

 

[Blu92]

The first connector is the OBD 2 connector where you would plug in a code reader to find and clear check engine lights. The second connector could be a couple things depends on if you have a 5 speed or an auto. If you have a 5 speed it may be a connector for the automatic trans brake switch which lets you move the shift lever when you have the brake on. If you have an auto it may be the connector for the clutch pedal switch that let's you start the car when you put the clutch in. Have one that looks like that on my 1g and that's what I always figured it was. No idea what the last thing is. Where is it located on the car?

 

[estoyaqui30]

That last picture is the audio amplifier for the infinity audio system. You can just lose it if your not using the infinity system.

 

[Jaydsm-]

The first connector is the OBD 2 connector where you would plug in a code reader to find and clear check engine lights. The second connector could be a couple things depends on if you have a 5 speed or an auto. If you have a 5 speed it may be a connector for the automatic trans brake switch which lets you move the shift lever when you have the brake on. If you have an auto it may be the connector for the clutch pedal switch that let's you start the car when you put the clutch in. Have one that looks like that on my 1g and that's what I always figured it was. No idea what the last thing is. Where is it located on the car?

That last picture is the audio amplifier for the infinity audio system. You can just lose it if your not using the infinity system.

OHH! Ok thanks guys! I have an auto trans right now, I have another engine with a 5 speed that i'm modifying making it ready for turbo so I'll be needing that info soon.. and as I thought the last pic is an amplifier, thanks a lot!
BTW any idea of that loose ground? I have no idea from where it broke loose from, guess i'll have to check it deeply.. also i got the car to start , loose positive cable to the starter motor

 

[bryanwheat]

OHH! Ok thanks guys! I have an auto trans right now, I have another engine with a 5 speed that i'm modifying making it ready for turbo so I'll be needing that info soon.. and as I thought the last pic is an amplifier, thanks a lot!
BTW any idea of that loose ground? I have no idea from where it broke loose from, guess i'll have to check it deeply.. also i got the car to start , loose positive cable to the starter motor

That ground wire is something that someone added, probably was for an aftermerket radio or something like that.