Usually ACC means ACCessory i.e. switched (ignition) +12V.
Sorry but most of us do have other things to do at the weekend!himnbandit said:So the Red goes to 13 - U14 ST DSP on the RNS-E harness and the yellow goes to the batterys positive(+) terminal?
You need to connect the RED ME3 ACC cable to an ignition switched +12V. And since there isn't one of them available at the RNS-E connections that means running a new cable back to the ignition +12V - which IIRC is on one of the screw terminals near the steering column. It's been mentioned here befopre, so a search should find it.himnbandit said:RED ME3 ACC cable into the straight power
Yellow ME3 Battery into U14 on the rns-e harness