Mystery wire(s) help

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The number after the dash is the wire size, and the letters indicate the color. Think: cigar lighter draws a lot of current, so it gets a 16ga wire and is Pink.
Glove box light draws almost nothing so it gets a 20ga wire and is also Pink. Seat belt light is Yellow but it's brighter and draws more so it's an 18ga, map light switch is Brown, and so on.

Remember: Smaller number is bigger wire.

The first numbers/letters are locations so you don't have visually follow a line around. M5 connects with M5 on the other end, and so on. You can just jump to what you need.

If Chrysler didn't need 16ga where 18ga would work, you bet your *** they're gonna save that money.