Help with identifying electrical parts

[tkach]

I'm trying to identify these parts, id like to sell the but want to confirm what they are before I post. All are in working condition and good shape.

 

Now I'm sure that

number one is warning buzzer

number two is the flasher

number six is the horn relay

 

However I Think that

number three is my rear defogger relay

number five is my timer unit

number seven is the ignition relay

 

This means that

I have no clue what number four is

 

I may be incorrect about some of these also Please if I am let me know, I'm trying to find out what I have, I don't want to sell somebody the wrong part.