One problem related to tail light switch has been reported for the 2004 Dodge Ram 1500. The most recently reported issues are listed below.
My parking and tail lights stopped working. , founs out this is due to the design flaw of the engine fuse box as the connectors are exposed to the weather elements , thus shorted out the circuit board that sends the a negative signal to the park lamp relay at 86 ,. The cost of the the repair is 500. 00. Dodge is fully aware of this issue as the replacement now comes with a splash guard plate to help protect the connectors. If you google 2004 Dodge ram parking light issue , you will see that a lot of us have this very same problem, they should honor this recall as it can be very dangerous to drive at night with out the taillights,.