Anyone know the easiest way to do this? I'm thinking a jumper in the underdash fuse box, but what to what? I don't want to have to turn the key to the accessory position for it to be hot. TIA. This would be on a GD3.

 

If you do it at the fuse block you could potentially put something else on constant. I would run some additional wires with a good source of constant power and tie into the OEM plug.

 

By OEM plug you mean the back of the accessory socket, right?

 

Yeah at the back of the socket. I would see if you can't use some sort of female spade connector on the back of the socket and just wire it to a constant power and ground. In the worst case I would find a socket in a junkyard and use the connector and do the same. That way you don't hack up the OEM connector.

 

Under the dash, in the main fuse box, there is a 5-pin socket with only 4 pins. This is called socket M. Pin 1, the top one, will be always hot when a fuse is installed into socket 20. I have a 20A fuse installed there. This is the second fuse socket from the top of the box. I have arrows marking these two locations. Neither one is used from the factory. I have a Hands Free link and a map light hooked up to pin 1 and I have the factory Garmin Nuvi nav system and the Hands Free Link hooked up to pin 3. Pin 3 is hot under Accessory and ON. The Hands Free Link (BlueTooth) needs an always on and Accessory for it to work.