Ronnie,
If u r trying fix it yourself is a long and hassle work. And require technical electrical knowledge b4 u could start the DIY.
It also depending on the HU you are trying to connect with....
Not all unit can be connected with due to the connection terminals, adaptor, and cables required.
In PJ I could reccomend u a place with many years of experience in this brand to install for u should u love this BQA 160 very much.
BTW the amplifier developed in year of 1980. Is a 20year + amp.
The choice is yours.