Friend and I are installing a system in his deck boat. The radio only has one set of preouts so we have used y splitters and ran one set of rca's to a two channel amp and the other set to a mono amp. The two channel amp is running 4 speakers in parrelle and the mono amp is running a sub. When we installed the system we added a new battery which powers the amps only, radio still runs to original battery. (will eventually put radio on new battery just haven't yet. Will need to get longer power cables first).
At first we ran remote wire to wire nut then split to each amp. When you turn on the radio the mono amp wouldn't turn on. So we daisy chained remote wire from one amp to the other and it still wouldn't turn on. To trouble shoot we hooked the remote wire directly to mono amp and it turned on and ran just fine.
At this point we figured the two channel amp was somehow over powering the remote wire so my friend found a separate remote wire coming out of radio which would allow both amps to turn on
However now when u turn the system up 1/4 of the way the mono amp cuts out (protection mode I guess, power light stays on). But if u disconnect the two channel amp it runs just fine.
Any guess where to start trouble shooting?