: 2004 SRX Non Bose Non Nav +12V Accessory Wire

01-05-10, 10:33 PM
What is the best wire to tap for a standard aftermarket +12V Accessory wire?

A few years ago I put a carputer in my car and I ran a full time 12V wire from my battery through the firewall to my DC-DC regulator.

I also must have found a wiring diagram at that time because I currently have a +12V Accessory wire connected to some wire in my Heater / Air Conditioner Unit.

Recently, it has been cold here - below freezing each day.

My guess is that whatever wire I'm connected to is temperature sensitive as to whether or not it gets a voltage.

If it is too cold, there must not be a 12V sent on that line - after about 10 - 20 minutes when the car warms up, the DC-DC regulator will kick on.

My question is there a better wire, that works regardless of temperature, to provide +12V on the radio or somewhere else nearby?