It's probably not equipped with a backup alarm from the factory. There is a weight standard for an alarm. You can install one very easily. Most parts store carry one and you bolt it on and connect the wire to the wire that works the reverse lights and it will work fine.
Wear the seat Belt !
The backup light switch on a 2003 E350 van is located on the column under the dash, just inside the firewall. The neutral safety and reverse lights are both controlled by one switch.
in the tank
In my 2006 E350 is is located in the trunk, on the right hand side, next to the spare tire compartment. It actually has 2 batteries, a main and a backup. The backup battery is located under the cabin filter/filter housing, under the hood, on the passenger side.
My 1998 E350 takes 6.4 litres, just changing last night
electrical
The book on my 1998 Ford E350 says to use 5W-30.
14 quarts
where is the fuse panel in a 1998 ford van 3500
I have a 460 in my 1983 e350.
how to change headlight on 1999 Mercedes e350
Fuse 12 - a 15V. I have a 150 wagon. Couldn't find the listing in the owner's manual, but I have an OEM shop manual and it listed fuse # 12 as the backup lights.