Ok, weird electrical gremlin

[Nacho-RT74]

This is new to me and I think new to everyone...

Press brake pedal and map light slightly dims on on "doors jam" switch position.

Nice huh ?

what do you think about this one

I think I can get where is the "problem" but I want to heard opinions

[OttawaCharger]

Previous experiences thells me that usually that kind of weirdness is caused by a bad ground although having it feed back through the maplight is definitely unique. 
I'd start by checking the bulbs grounds in the tail light and check the ground on the tail light itself.

[Nacho-RT74]

That's what I was thinking ground of tail lights assembly. Is a wire with an eyebolt terminal attached on to trunk/quarter frame. Weird stuff is just ( as far I noticed ) when I press brake pedals, However explanation it could be that the positive source of Map light and Brake lights are the same Line as far I remember, since don't dim at parking position. I haven't checked if also dims on at hazard and turn lights

but I bet this specifically germlin is new to every body HUH ? Front parking lights and top of fender o hood turning lights glows depends of year are more common

[OttawaCharger]

Definitely unique. 
I'm afraid I'm ignorant as to how the Charger is wired. But is it possible that is is feeding back through the brake light trouble light circuit on the dash?

[Nacho-RT74]

No way. Completelly different lines. Dash gauges are feeded from accesories position ignition switch. Brake lights, map lights, hazzards, dome light, glove box light are direct batt feeded.

Headlights switch has one fuse before to all the system ( shared by other stuff ) and one fuse after that protects just the dash ilumination/dimemr function ( also related, like console ).

You can know what items are related by the common fuse. Owner manual is a guide.
Mostly of these problems can be located by the fuse function so checking related items is a good guide.

[tan top]

just a thought , low battery voltage

[TylerCharger69]

Sounds like a ground issue to me....

[Nacho-RT74]

ok, checked and tail lights ground wire looks tight... so my next thought it could be a damaged tail light bulb, making contack wrong between terminals inside socket.

Ground at map light... I don't think, since is a wire directly attached to dash frame and is tight. Maybe door Jam switch ground ? that it could be since dims on on door jam light on switch position. I'll check if dome light also dims on.

Low batt voltage ? I'll check, even everything looks normal everywere... cluster, glovebox, parking lights. True I have noticed dome light doesn't lights teh same, but maybe dome lense what was new instaled about 4 years ago is starting to fade or bulb close to blow.

Definitelly I think is a ground issue, but where ?... adventures continue.

[Nacho-RT74]

Ok new one LOL

OPEN TRUNK AND MAP LIGHT DIMS ON... lol. If you also press brake pedals, dims even more LOL.

Unplugged rear harness at trunk plug and saved the dim on at brakes light, however trunk opened still makes dim on the Map light. Of course, trunk light plug is before this taillights trunk plug. I didn't tried unplug the trunk light wire, because OBVIOUSLLY will "fix" the problem LOL... Now I'll start to track up to underdash harness.

casuality ?... both wires ( brakes and trunk light, same as map light ) are direct batt feeded, not from accesories... more thougths please. I heard comments.