Wiring diagram

[2nd chance]

I’ll apologize for being new to Mopars and being terrible at electrical but I am looking for a detailed wiring diagram for 70’s mopar for a run stand and I am also wondering what that thing in the picture is. I’ve asked several people that I thought would know but to no avail. I have a good start on the stand that I have built myself and would like to do the electrical right, thanks for your help .

 

[493 Mike]

Your photo is of the horn relay.
Mike

 

[kiwigtx]

Nice solid looking run stand.

 

[Lefty71]

Looks like you have this figured out. For reference, wiring diagrams for many Mopars can be found and downloaded for free at Mymopar.com, along with a huge amount of other reference material. Def a site worth supporting.

 

[Belvedere408]

You can get a laminated wiring diagram from classiccarwiring.com I got one off eBay it's been a great goto.