well my manifold heater relay switch is melting and seems to be just about shot. This is the black box on the fender under the hood on the drivers side. There are two little black boxes with 2 wires going to each one. i went to the local dealer since napa didnt have anything and the part was discontinued from dodge. has anyone else had this problem or might no where to get a replacement part for this?????

 

I assume you are talking about the relays for the grid heaters,
when mine went bad I just replaced it with a Ford type starter relay.

 

The grid heater relays were made by Stancor. They were sold to Dodge under White Rogers name plate.

You need a stancor # 120-901

 

Eliminate them, use ether if necessary.