The “made in China” Packard Stock No. PR380 Fan Relay
now has number 6 contact spade lug overheating.

The bright shiny metal of the #6 lug has turned blue from heat.
The spade #6 wiggles
but spades 1-5 are tight.

I originally thought the 36 year old female spade had a loose wire crimp that was causing heating,
but when I replaced the wire and female spade connector and started the unit back up,
my IR gun showed a hot connection developed again.
As I watched I saw small sparks shooting from behind the rivet
that secures the mount of of the male spade lug of number 6 contact to the relay body.

On the Packard relay box it says “Cross Reference 90-380”

Amazon.com told me that refers to a
“Made in USA” Emerson 90-380 Fan Relay with an Amazon cost of $8.47

The original relay from 36 years ago was a ESSEX B12173-1

Going to have to rely on electric heat overnight until Monday.
Luckily the lowest temperature predicted for tonight is 36 F.