I found this last week:
http://www.the12volt.com/relays/page5.asp#drto How to wire the radio to stay on till you open the doors.

I’ve finished wiring up the relays and it seems to work, so now it’s time to install it in the car. I’m going to have to use a new power source for the head unit, probably directly from the battery and I just wanted to know if I should place a fuse on that line. The head unit already has a fuse, should I add one immediately after the battery anyway?

-J

>I found this last week:
>http://www.the12volt.com/relays/page5.asp#drto How to wire the
>radio to stay on till you open the doors.
>
>I’ve finished wiring up the relays and it seems to work,
>so now it’s time to install it in the car. I’m
>going to have to use a new power source for the head unit,
>probably directly from the battery and I just wanted to know
>if I should place a fuse on that line. The head unit already
>has a fuse, should I add one immediately after the battery
>anyway?
>

i would put a 10 amp fuse in between if your running 18 or above

if 14-16 go with a 15 or a 20

hawaii boy