Dinoakaliam,
You did not say where you are at so I don't know if my suggestions will help, but I'll give it a try.
I certainly sounds like an electrical problem. I have a few questions -
• When you noticed the lights wouldn't come on, did you try to start the van again? If you did not, then I suspect the battery was already almost fully drained. That means it was not taking a charge while you drove. If the battery is drained the following must be considered:
a.) The battery is defective and will not hold a charge. If you have another vehicle you might remove it and take it to a mechanic or auto parts store to have it checked. Even a new battery can fail. If the battery is OK then the problem might be with the Alternator or the wiring.
b.) To find out if the alternator is defective - you would need to charge the battery so you can start the van then have a mechanic check to see if the alternator is charging the battery. If the alternator is charging OK and the battery is OK then the problem is most likely with the wiring.
c.) Corrosion on the battery terminals can interfere with charging the battery so make sure they are clean. It is also possible that the wiring is shorted somewhere and draining current from the battery, although usually when that happens it blows a fuse. Check the wiring bundles in the engine compartment in particular. If you have a Volt-Ohm meter, once you have charged the battery you can connect it between the (+) terminal of the battery and the battery connector and look to see if there is any current flowing when the key is turned off. If there is more than a trickle, then you either have a short or something that does not shut off when you turn off the key. While it is very unlikely, while you have the (+) battery connector disconnected you might want to check continuity across the big fuses in the power distribution center (part of the + connector.) Information on troubleshooting the electrical system and checking fuses can be found in the Service Manual which is downloadable here..
http://www.filefront.com/14781099/05-service-manual.pdf/
Tim