Having an issue with a 1600 watt 4 channel amplifier. Have both amps connected to the same sources but the 4 channel amp does not come on. I made a new ground for the 4 channel amp, ran a new remote wire, nothing. Swapped amp wiring kit from sub amp to 4 channel and nothing. Only way I can get the 4 channel amp to come on is by making an inline fuse jumper from the remote slot to the power + on the amp. Doing this keeps the amp on all the time. Just can't figure out why one amp works while the other doesn't. All connections are secure and reading 12v. Had a 600 watt 4 channel hooked up before this amp and had no problems for 8 years. Just swapped all the wiring from old amp to new and am having issues. Any ideas?