Join Date: Nov 2001
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Here's a suggestion from "first principles":
In a car, your radio will not turn on if the ignition switch is "off". It only works if the ignition switch is on "acc" or "on". This is a safety feature -- it ensures that the radio is off when you leave the car.
One way to accomplish this is to wire the radio red "+" to the battery "+", and require that the yellow wire _also_ is energized in order for the radio to be turned on. If the ignition switch is "off", the yellow wire isn't energized, and the radio can't be turned on.
On a boat, I wouldn't want my radio turn-on to depend on the ignition switch position. So, I'd want the yellow wire _always energized_.
I suspect that the right thing to do is to hook the yellow wire to the same "+" terminal as the red wire (or just hook it to the red wire near the radio).
If you leave the boat, and the radio is left running, your battery will go flat. So you'll have to be smarter than the average driver.
I'm assuming that you have a switch and fuse (battery master switch, or circuit breaker) between the radio and the battery's own "+" terminal.
I would buy a beer for a local auto sound installer, or ask a marine electrician, before acting on this advice . . .