What's the 3rd wire do?

[bennylava]

Never really thought about this one, but what's the 3rd wire for, in the reverse lights? I'm asking because I'm having to change out the LED bulb in the reverse light on my 87 due to corrosion. But I noticed the wire on the outside of the plug is disconnected. The one not coming out of the bottom. But the light was working anyway. It only recently died.

So I wanted to ask what that 3rd wire is actually for. And if I should hunt it down and connect it when I replace the connector.

This one has 2 wires:

https://www.amazon.com/Standard-Moto...ustomerReviews

This one has 3:

https://www.amazon.com/ACDelco-LS244...ct_top?ie=UTF8