My son inlaw has a 92 ranger 3.0 and his alternator to be replaced. What concerns me about it is the new alternator has a connector that has wire leads with a tag that says do not unplug. We have never seen one like this before and he was a parts person in the days of selling a lot of them. My question is has anyone seen this and where do we connect the wires. Any advice is greatly appreciated thanks.

 

No, never seen that before on a new alternator

In 1992 there would be a larger single wire, black/orange stripe, connected to the stud on the back of the alternator, it has a fusible link at the Starter Relay(solenoid) post, Battery positive post

Then a 3 wire plug for Voltage Regulator, one of these wires, white one, is just a jumper that connects to a single spade terminal on alternator
Other 2 wires go to the vehicle's system:

Yellow/white wire is to monitor system voltage, connects to fuse #12, 15amp in engine fuse box(different fuse in 1993 and up)

Green/red wire is the Battery Light wire, this is also used for "Startup Voltage", an alternator needs voltage to start generating electricity, if it was left connected all the time it would drain the battery, so this green wire is the ON/OFF switch for alternator.

If all wires are disconnected
Black/orange wire should show Battery Voltage, if not fusible link is blown
Yellow wire should show Battery Voltage, if not Fuse 12 is blown

Green wire should have 0 volts key OFF, Battery Voltage key ON

When testing these wires always use the metal case of the alternator as the ground, this also tests battery negative cable connection to engine block

Maybe they want you to splice into your wires, I don't see that as "better" but not sure what new alternator you have

Post make and model or link to a picture of it on car parts web page