I connected the amp's sense cable to the accessory fuse on the fuse box. It
now works! The only odd thing is that it does not come on at the key's
accessory position, but the "on" position. This seems to be the case with
other "accessories", like my electric radiator fan. Is there some sort of
issue here? BTW, there seems to be no requrement for grounding the sense
cable individually; there is one big ground cable from the amp for the whole
thing.
Now that I know that it can work in this way, I may connect the sense wire
to an "always on" fuse and put in a switch, to give more control as to when
the amp is on.
Steve
----- Original Message -----
From "John Innis" <jdinnis at gmail.com>
Cc: "Midget Group at team.net" <spridgets@autox.team.net>
Sent: Tuesday, August 02, 2005 4:22 PM
Subject: Re: stock radio in front, mp3 player and amp in back
> One more note on this. Depending on your AMP, you may need to apply
> voltage to this wire or ground it. For voltage, I usually use an
> existing circuit in the car that is hot in accessory. In this case no
> need for resistor. Current is not an issue, but you do want to have
> the AMP off when the ignition is off to prevent slowly draining your
> battery. If your AMP requires a ground on this wire (check the manual
> to be sure), then you should use a diode or resistor to limit the
> voltage drop across the amp sense circuit. In this case I usually use
> a transistor or relay to ground the AMP sense circuit when the key is
> on (agaon, accessory or run) and open the circuit when the key is off.
> Let me know if you need more details about this circuit, I can gin up
> some pictures.
>
> John
>
> > It just has to sense
> > something, so hook up a resistor and a switch.
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