The driver side of my (transit tourneo) heated windscreen doesn't work, after checking relays I checked behind the A pillar and found the spade connector had been disconnected and both sides covered in insulation tape, obviously this has been done for a reason, so, me being me thought I'd connect them and see what happens, well after a few seconds the connector gets hot, a lot hot than I'd imagine it should be, so what would be wrong that it makes the connector heat up?

When I say hot I mean I can touch it for a few seconds and that's it