Tom, I have the same year sprinter as you with the same wiring. I am looking to update to the lithium batteries and wanted to see if you could give me some pointers on how you did it. Also I saw in a previous post you upgraded the to the PD4060. When i researched the PD4000 whihc is factory installed the site says the PD4000 works for leadacid, AGM and Lithium.
