Amplifier Wiring - Pioneer GM-3000

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Hello guys, recently I bought an amplifier over ebay.
The model is: Pioneer - GM 3000 the version with 8DIN connectors at the back, however seller didn't mention that.
So I spoke to an electrical mechanic who added chinches to this connectors and tried the amplifer locally at the workplace and it's working.
Whenever I tried to connect it to my car, it does start for a couple of seconds, but the noise is really strange like I have a broken speaker and then it turns off.
He told me maybe bad ground or something, but I tried on a different car with differents cables and it remain the same issue.

I thought to myself if the cables aren't strong enough maybe they don't provide the necessary power to supply this monster
the cables I ordered are these:
Cables I ordered

I connected everything as it supposed to be, but it doesn't work at all.
It starts for a couple of seconds then it turns off, maybe goes in protect mode but I don't understand this very much.
Any advice appreciated also if you have service manual for this model: Pioneer GM-3000 I will be very happy.
An externally hosted image should be here but it was not working when we last tested it.
 
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