2) The Empeg's Blue (Amplifier Remote Power On) wire would be connected to the Kenwood's ACC (Red) wire thus in theory causing the Kenwood to turn off when the Empeg is turned off manually.


Make sure that the Kenwood ACC line is a "signal" wire only. Some radios draw their main power from the switched lead, using the constant only for memory. (see below)


3) The Kenwood's existing External Amplifier Control wire (pink/black if you're interested!) would connect to the amplifier's control terminal thus in turn switching it on when the Kenwood switches on. The only down side here is the Kenwood will have to active whenever the Empeg is in order for the amp to work but that's not a real problem.


Still sounds like a pain in the long term...


Unless of course the Empeg could supply enough voltage down the blue wire to turn on the Kenwood AND the amp itself... but that's another question and this post is far too long already


Voltage isn't the issue - current is. And that can be solved by a relay.
I'd have the empeg remote line (blue) turn on a relay (also solves the problem if the ACC in on the Kenwood draws a significant amount of power) which then powers the Kenwood ACC line and the amps remote in. If the Kenwoods ACC line is mere "signal" then the empeg remote out probably can handle both that and the amp, if not - use a relay.

Don't recall seeing anyone answer your question if your current 12V feed would be capable of handling 2 units. As you're not going to be using the power amp in the Kenwood, thereby drawing less than normal current, that shouldn't be a problem as the empeg doesn't draw all that much either.

/Michael