Won't turn over, lights still work - 2001 Dodge Caravan

Look Behind the triangle panel on the left side of the bike. Next to the battery. FUSES

Just because you charged the battery it doesn't mean it is any good. Modern sealed batteries fail; just as you described, fine one moment and then nothing, they go open internally.

Push the headlights switch in. The switch doubles as the cabin light switch and it easy to activate the cabin light when turning the headlights on or off

One of your bulbs is out. Turn your flashers on and walk around your vehicle to see witch one it is and replace it.

have battery tested if good fully charge,then check all relays and fuses.

I would take it back to whoever did the install, and see if they will correct it. Is your light switch to flip up the lights on the steering column? Possible they pinched or inadvertently pulled a wire loose. I know on toyotas the flip up lights work off the light stalk, independent altogether of the ignition switch.

Batter charged? Could be a starter also. And dirty cables. Does the interior lights work or head lights.

Sounds like your battery is just too dead, has enough juice to light up the system for a minute but cranking drains it and if it wont charge then deff fried, you could try removing the battery and starting the car with cables to confirm the starter still works. If a bettery is too dead then when you are jumping it, it takes to much of the power just trying to get through the battery.

First check the headlight relay by changing it with one of the same number in the fuse panel.If it checks out ok then you have a faulty headlight switch.

I found a paritally blown fuse. When the fuse blew metal pieces ended up partially making contact. After replacing the fuse everything worked great.