Does Ford Expedition have a auxiliary battery? and if so what does it power and how does it function?

 

It may depend on the Ford yr/model/series or if the aux battery was factory (which I have not heard as an option) or aftermarket install which most likely if added, would be connected for whatever you wanted: mobil or stationary use with AC power inverter, winch, flood lights etc.when the car engine is off. I would think you would get a quicker response on a Ford car forum or a search on the internet with your question. For this is a Scion car forum.

Good luck on your inquiry.....

 

Thanks for your suggestion!