Forum Discussion
77rollalong
Aug 19, 2018Explorer
on our 77 e350 the pass side battery is for the engine, and drivers side for the RV, easiest way to find out which is which is to disconnect the neg terminal of one battery , and then try the ign of the truck and see if you have any dash lights or rv lights. you could still have to replace both batterys because of sitting discharged for so long.
About Motorhome Group
38,718 PostsLatest Activity: May 03, 2025