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Your E350 should already have the second battery, it's mounted on the frame rail under the side doors. My 5.4 gasser has one. The second battery on the gassers is mostly for running trailer electrics.
[/ QUOTE ] Vans with a gas engine will only have the second battery if it was ordered with it. It is a stand alone option (at least until 2003).
Your E350 should already have the second battery, it's mounted on the frame rail under the side doors. My 5.4 gasser has one. The second battery on the gassers is mostly for running trailer electrics.
[/ QUOTE ] Vans with a gas engine will only have the second battery if it was ordered with it. It is a stand alone option (at least until 2003).