Relays

 

A 12V, 30A  SPDT Relay

 
 

All relays perform some kind of electrical switching function. 

I use this type of relay for operating my handlebar switches, starter, headlights - Hi beam to Low Beams - horn button, turn signals, etc.  The illustration below shows one of my fuse/relay panels

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Q

 

Got an email from a guy who wants to use this relay to activate the clutch in an auto stick tranny.  You need to send a ground to the tranny from the handle bar switch.  So here is the diagram as I understand it.