2004 Dodge Ram 1500 Tail lights are not working. I have checked. --All bulbs --Wiring under truck looks good --Fuse for "Tail and Park Lamps" --All turn signals work --All backup lights work --All brake lights work. --No front or back park lights --No License plate lights. --No Running Lights for trailer hitch Any ideas?

Hello ehenry917... Yes

Ideas 2.

Go to the output of your light switch
and check for your voltage output ... (term 2)
(to your INTEGRATED POWER MODULE
there)... the IPM (drawings show relays).

I found no relevant Technical Service Bulletins
(3) on BBB Industries website and found out
the CONTROL MODULE CONTROLs everything.
BBB Industries Premium Alternators Starters Power Steering Products

So you are down to SWITCH Voltage testing & trying
the IPM yourself... Finding a GOOD MECHANIC...

DO IT YOURSELF manuals
Literature Repair Manual Electrical Repair Manual Parts RockAuto

Or surrendering to the DEALERS
(poor idea in my opinion/experience).
2004 DODGE RAM 1500 PICKUP 5 7L V8 Headlamp Switch RockAuto

My best recommendation: You have a 50 amp fuse
FEEDING several subtending circuits...

That and your PARK LAMP RELAY (high probability).

Popular part... (usually good idea to look there)
2004 DODGE RAM 1500 PICKUP 5 7L V8 Parking Lamp Relay RockAuto

Hope this helps

Carnac the Magnificent

Go to online store reliable they have repair manuals I am sure you will get the solution. Here's the link 2004 Dodge Ram 1500