Saw this site on another forum http://repairpal.com/cars/dodge/caravan
and under the Electrical & Lights Section it said: Voltage spikes can cause erratic behavior in the electrical system (lights, locks, wipers, headlamps). This is often caused by relays. Inspection and replacement of relays is required; revised relays are available. Looks like Dodge has had problems with this and have a revised relay available, theres lots of info on every make and model and repair issues on this site. Check it out!