Most aux cig lighters are 20-25 amps in the trucks. Dont plug into the actual cig lighter but the aux only...
My specs I gave is for a latest and greatest 0-2 gen..
I dont think you need to upgrade the wire on that aux jack.. Pluse the aux jack is fused. You would just blow the fuse in the truck if there was an issue..
Plus its a step up transformer I belive that comes with them...
Specs from DC power cord...
DC Input: 13.5 - 15V ==== 10A Max
DC Output 19V === 5A
and specs from a/c cord
Input: 100 - 240 VAC, 50-60 Hz
Output: 19 VDC, up to 90W
I myself on my way to florida had a 120 watt inverter plugged into mine running a dell laptop for my son in the back seat... That aux jack on my silverado is 25 amps...
Im sure his truck as well as all have 10 gauge wire from that outlet...