Anyone know where this wire goes? 1970 Challenger

It is the wire with the red terminal coming off the brake light switch or housing. I cannot tell as I cannot get all the way under there since I had rotator cuff surgery.

It looks like, without knowing and looking up that particular colored wire, the wire that feeds the brake lights That is if it is hooked up to the back side of the brake light switch like it appears to me

I am not talking about the wires with the tape on them. I am asking about the wire with the red plastic terminal down towards the pedal sticking out of the right side as you are looking at it. Ground????

I know this wire must be serving as a ground of some sort as I have blinkers, tail lights with headlights on but no brake lights. If I tap into the brown wire running to the back the brake lights will work on one side.

How does this make any since?

If I am reading the wiring diagrams correctly, it goes to the turn signal switch. My understanding is that the brake lights run through the t/s switch so your rear light will flash on one side while the brake light is on on the other side.

It is possible for a bad t/s switch to cause brake light problems.

http://www.mymopar.com/downloads/1970/70ChallengerB.JPG

Brake lite power comes from the brake lite fuse in the fuse box via a pink wire to the (pic) brake lite pedal switch & it is hot all the time (think hot pink). The "out" white wire which is hot when the pedal is depressed goes to the TS column harness. With the stalk in nuetral 2 "out" wires to the L/R rear brake lites are hot when the white "in" wire is hot with pedal depressed. Your wiring looks altered. Seperate the TS/brake column harness & see if the white wire and the 2 out wires in the col half of the connector have continuity with the stalk in nuetral/hazards off (they should). See if the white "in" wire on the body half of the col connector is hot when pedal is depressed. Jump fire to the 2 wires in the body half of the connector that go downstream & see if the L/R brake lights light up. You want the hot in wire (which should be pink) at the pedal switch to be hot all the time & see what's up with your colors. Holler back. EDIT The 2 cojoined wires, one is hot in from the fuse box and the other powers the dome lights (hot all the time) & both were pink (OE). The single wire that you are inquiring about is the switched 12V going downstream to the column TS/brake harness & to/thru/out the TS switch (where 2 wires are energized at same time for R/L brake lights) then to the dr kick panel harness then rearward to the brake lights on each side. Not sure why your colors are different

No expert, but that doesn't look factory. Looks like a terminal someone has added. Factory used those big square plastic cases.

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I am not talking about the wires with the tape on them. I am asking about the wire with the red plastic terminal down towards the pedal sticking out of the right side as you are looking at it. Ground????

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No, the switch is a normally open type switch so when you push the brake peddle down it connects the two set of wires connected to it switching on the 12V to the brake light harness The grounding is done at the bulbs on that circuit The turn siganl switch in the steering column comes into play on the rear tailights and brake lights