I looked but have no clue what I'm looking for. Everything seems hooked up.

The truck just passed inspection the other day but I notice my reverse lights aren't working. I had something small that could fit in ones hand replaced a few years ago (I think near the transmission) that fixed the reverse lights when they didn't work then. What's the part called and could it be contributing to my cruise control issue?

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2001 Ford Ranger XLT, 2.5L engine, single cab, manual transmission, RWD