Suburban towing package fuse box location

25v is model # of motor RV coach. not volts.
well the fuse is wrong size
or there is a short in the end to end of the feed line
not told what fuse blew.

top cause wired wrong at hitch
cars cam have upto 12 park lamps but not Fiat500, less

parks (tails)blinkers.or reverse or brake feed.the fuse is marked as to its use.

most wise makers of hitch kits
have a buffer box for the towed (trailer car)
that has its own fuses, so fuses in the RV never blow.
buy this kit and install it. if not there already.
or get an RV center in the loop.

Congrats, you have found Ford's super secret fuse that drove everyone mad for years!

No, you cannot. However, if you choose not to spend the money on a new underhood fuse block, you can still get around it. Most auto parts stores sell jumper harnesses that will allow you to plug into both rear tail lamps for all of your trailer lights, and then the jumper plug has a connector on the end that plugs into your trailer. It's generally cheaper than installing a new fuse block with the trailer circuits in it.

If the fuse blows on different trailers then it's all down to the vehicle. You either have incorrect wiring on the vehicle, a short OR the fuse is not of a high enough value to cope with the additional brake lights? You could try removing all the trailer bulbs EXCEPT the brake lights - e.g. if it's trying to power up the indicators too? That would stop the fuse blowing...... OR remove the brake bulbs from the vehicle & see if it operates the trailer without blowing...... Check the total wattage of ALL the brake lamps & see if the fuse is actually of a high enough rating? Be aware though that increasing the value of the fuse could cause damage elsewhere! As a rough guide a 25 watt bulb will pull around 2 amps at 12 volts - so 4 bulbs may pull up to 8 amps & clearly blow a 5 amp fuse! If in doubt take it to an auto electrician...... The wiring needs to be correctly protected!

More than likely your van is just missing the required fuses and relays. In the fuse panel in the engine compartment there should be a 20amp fuse in location F48, a 20amp fuse in location F57, a 15amp fuse in location F58,and a 30amp fuse in location F63. There are also 4 relays required. 2 rectangular 5 pin(Part#F5TZ-14N089-B) and 2 small square 4 pin(Part#5L3Z-14N089-AA). Unfortunately these are not given locations so I will try and give you an idea of where they go. The 1st 4 pin goes above fuse F53 and the 2nd goes above fuse F56. The 1st 5 pin goes above fuse F17 and the 2nd goes above fuse F21. If you have the owners manual these will be easy to find or a diagram may be stamped into the fuse box cover. Also some vehicles come with all the required fuses and relays and instructions in the glove box for adding trailer tow. I'm not sure if an E350 is one though.

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Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4 way tow vehicle side.
4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5 way tow vehicle side.
5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6 way tow vehicle side.
6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.

6 way tow vehicle side.
6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.

7 way RV flat blade tow vehicle side.
7 way RV flat blade trailer side.

You have got 7 pin trailer connector that was included in the optional trailer tow package. This trailer tow package also includes an electric trailer brake wiring provision that terminates at a connector located on top of the large body harness connection under the instrument panel to the left of the break pedal, as well as an electric trailer brake pigtail harness and an instruction card that are stored in the glove box when the vehicle is shipped from the factory. You will need to add an electric brake controller of your choice that will plug-in to the harness and that will also give you power on your auxiliary circuit.

the tow light fuses are under the hood if it is a factory install you can go to this website and print the whole manual for free or just what you need ( fuse locations) good luck
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

you have to put the fuse in to make it hot