This is a NOS MOPAR CHRYSLER RELAY. 

An internet description says that is for a 1992-1993 jeep cherokee. It may be also fit other years and models. If you think it may be the one for you let me know and I will try to identify it. I believe it is 40 amp.

This item has been in indoor inventory for 20 years. See Pictures Below.

Stamped: 36003046

(location: ebay box #199)

RCW