Hi @scottjeffrey ,
You are fortunate that you know which connector pin it is.
Hopefully there is enough slack in the harness to be able get to it to fix it.
Usually the wires in the connector plug (socket?) are crimped to the connector pin, either male or female (don't know what you have)
They don't strip the wire but the connector pin has "teeth" which cut through the insulation to get to the wire when it is being crimped into the pin.
If you are lucky,to get the pin out of the plug (socket?) holder, on the top of the plug (or the bottom- if it is a double row) for each pin you might see just a bit of metal in the plastic in line with each pin. This is the "barb' on the pin which prevents the pin moving back in the wire direction when the plug is inserted into the socket, or to allow you to remove the pin easily by just pulling on the wire
If you push down on this bit of metal with a pin, nail etc whilst simultaneously (gently) pulling the wire back out of the plug the whole connector pin should come out so that you can either re crimp the wire or remove it, strip it and solder it to the pin.
You then just have to reinsert the pin from the wire end until the barb click into its slot (check in the pin's plug hole for where the "barb" projection is so that you line the barb up with the barb holder (for want of a better term) or make sure that it is on top (bottom) so that you'll see it in the slot where you used the pin to extract it,
If you can't see the barb because it is a solid plug, you could try using a pin from the open end (not the wire end) and push it down between the connector pin and the plastic hole which it is in and try to push the barb down, whilst gently pulling the wire back out at the same time.
Don't pull too hard because you might pull the wire out (if it is a loose crimp) and leave the connector pin in ;-(
Another option is if the pin on the harness connector is a split male or split female pin (either one) i.e. it is actually two segments and not a single piece of metal you may be able to use a small screwdriver etc too slightly widen the pin (open the split ) if it is a male pin or to close the split a bit more (if it is a female pin) so that more tension is placed on the pin in the connecting socket on the pcb ensuring a better connection
Hopefully this makes a bit of sense ;-)