This what I recommend, its output is 5 volts NOT 6 volts. My research says to use a 5 volt on Mopar's.
12v to 5v Volt Converter, DROK DC Voltage Regulator Board Power Supply Module, DC 6.3-22V 12 Volt to 5 Volt 3A 15W Waterproof Car Volt Step Down Buck Converter. Over-current protection; over-temp protection; input reverse connection protection; short-circuit protection; waterproof; dust-proof; moisture-proof; shock-proof. $12.59
Real time engineering wants $50.00 !!
https://www.amazon.com/gp/product/B07P663XJV/?tag=fabo03-20