What are these doing??...
 

Hi all!

I have a '74 Triumph SpitFire that has a Mazda Rx7 rotary motor in it. I recently lost my lights and multiple other things. I am pretty good with a test light and point to point testing to find electrical problems. I tracked my issues down to a bad headlight switch and some faulty wiring and a bad ground. I now have all that sorted out and everything works fine now. But I have a question. These two boxes are on the engine bulkhead and one goes to the electric fuel pump and the other goes to the ignition it appears. I think they are relays but I really don't know. So, my questions are:

1. Are these relays?

2. What do they do?

3. They each have multiple wires connected to multiple post on each. How can I find info for what each post is doing?

As always, your help is always greatly appreciated.😊

They are relays, from the information you gave, I would say fuel pump relay, and would need more information about the other one

As it's a custom installation, there's no way for us to know what the relays do from an image alone.

Almost all automotive 12V relays share a common pinout though, shown below:

http://www.reuk.co.uk/OtherImages/5-...tive-relay.jpg

You can then follow the wires either visually or with a continuity check.