Electronics - need ACC trigger

Anyone have a wire diagram or can point me to a wire that gives a pos or neg trigger when key is in Acc & Run positions?

I've added a relay box under the hood for accessories (fogs, compressor, etc) currently wired directly to battery via 50amp breaker. I have a tendency to leave shit on and drain my battery, so the right thing to do is to tie my relays into the Acc/Run circuit so all my aux stuff powers down when i pull the key... ie: like OEM functionality

Preferably the Acc/Run trigger would be under the hood, maybe in the oem PDU, but I dont mind running a wire from the steering column either.

Working up a circuit diagram in multisim to show ya'll, will post when ready.