Lauren The relays carry the large current load of the lights from a direct 12V source which removes that load from the light switch and dimmer switch. Each switch is relegated to the low current task of energizing the appropriate relay as needed. The installation is a matter of locating the high and low beam wires in the wiring harness, cutting those wires, and attaching the ends from the switches to the coils of the relays. The other portion of the cut wires are attached to the 12V output of the relays. I performed most of the modifications on my G under the battery tray to keep them from view and attached the relays to the radiator bulkhead on the battery side. There are usable holes for mounting already there. Auto resetting Circuit breakers are included to protect the car from any unforeseeable shorts in the 12V circuits. A relay kit is important for high beam because four filaments are used which draw alot of current. The low beam is not as critical because only two filaments are used. Most buyers have used two kits because they are cheap insurance to avoid destroying the light switch. Any modification to more powerful lights, in my mind, makes the addition of relays mandatory. All current car manufactures use relays for lighting and many other systems and have for many years. One of my cars which I bought new has relays and it is 37 years old. Marshall _________________________________________________________________________ _____________ Your light relay kit. How does it work? Have relays. Is it best to do the 4 headlights? Use the 2 kits? Is it a plug in set up, or do you have to do a lot of rewiring. I completely rewired the car. Got the Kit from a 300 Club member in Canada. Lauren R Lampi Grand Rapids, MN [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/