What are these parts for?

[hotrdd]

So I finally got my bike started, though I still need to know how to test the coil to make sure there is enough power coming out. But part of my goal is to get rid of the electrical junk I don't need and rewire the bike, can anyone help tell me what the parts in the picture and what they do? Do I need it? Also are there any issues with these being placed in the battery compartment that is closed in under the seat. Or do they need to be cooled?

1)
2)
3)
4) Rectifier -

 

[hotrdd]

Can anyone help name this parts and what they are for?

 

[jayel]

go here, find your year/model wiring diagram, check the colors of the wires to the different parts

http://www.xs650.com/media/albums/55/

 

[littlebill31]

3 looks like a canceling unit. 1 a starter solenoid. 2 safety relay?
Your rectifier should be in an area with air flow.

 

[hotrdd]

So it looks like #2 is the regulator, not sure what it does yet. And number #4 is the rectifier, also not sure what that one does. #1 is not the starter solenoid, it's a box that lookslike the regulator and when I opened it up it has a magnetic solenoid inside. I'll take a look at the wiring diagrams and see if I can figure this out.

 

[hotrdd]

#3 looks like it's the light check. I didn't find number 1 on the electrical diagram though.

 

[olddude13]

holy crap i got rid of that stuff Lol...... Hope i doin't need it...............

 

[CDNTX650]

Rectifier, changes AC to DC.. Regulator keeps it around 14 volts DC. you need those. if your lost, better start reading.

 

[XSLeo]

#1 is looks like the safety relay.
#2 looks like the voltage regulator. Should have a large wire wound resister colored green along one edge.
#3 looks like a light checker.
#4 is the rectifier.
What year is the bike? I've never seen a box like that to hold the electrical parts.
If you want the bike to charge you need the regulator and rectifier. If you use the electric starter the safety relay isn't a bad idea, saves on starter gear wear. The light checker can go.