I recall when I wired the taillights on my '15 RAM 1500, I first tried a "plug-in-kit" which did not work and I had to wire the lights by splicing into the wiring. There are three wires to each brake and each taillight, one being a "sense" wire to detect if the light is failing. I had a diagram which showed the color codes.
Being a Mopar, your Grand Cherokee may have a similar thing. If I locate the diagram I'll post it.
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... Rick P.
07 Signature. (Prev: 00 Dip, 02 Dyn, 05 Sig).
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