Check all of your connections. You have a battery under the frame, too.

 

 

I don't know but I'd make sure they were all clean. I also grease mine.

 

I would check all the ground wires too. Since you are certain you have enough power the grounds are most likely the problem. Is the starter in tight and well grounded to the block? Are the negative cable connections to the block clean and secure?

 

Clean and spray all grounds and terms as well as the starter. New world.

Denny

 

The starter would engage on only one battery. On pickups there's a stud (I think under the air cleaner) where the battery cable is joined to the vehicle power cable, the van probably has a similar junction and might be your culprit. If when you turn it to start other stuff shuts off it's an indication of a bad battery cable/main power feed connection. If everything stays on it's an indication that the problem is within the starter circuit.

 

Do the 2002-2003 E series have the same connection that the 2002-2003 F series have on the drivers side fender liner where there is a small battery cable attached to 2 fusible links on a post inside a small plastic box? On the F series when this connection goes bad nothing works.

 

 

Good you got it, thanks for the update. I always grease those connections when I have them apart to stave off corrosion in the future.