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I picked up some small Bosch relays at Pick-n-Pull. They came out of the fuse block area. They have 12V 10/20A and D332 207 103 on them. They are so nice and small it would be nice to be able to use they for headlight relays or switching something like that but I am thinking they are too small. Sorry for the pitiful picture.

http://i420.photobucket.com/albums/pp282/mdg0806/64panel002.jpg
 

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It looks to be a single pole double throw relay. They can come in handy. 10a/20a is pretty light duty. There should be a schematic on the side of it. Search ebay or other electrical source for the connectors. That size would be good for a fuel pump or converting a ground signal to a positive current. I actually need one for the AC input to my fan controller.
 

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They would be good for things like a keyed cigarette lighter or something, but I wouldn't use those for headlights, They are usually at least 30 amp.
20a is enough for the headlights. Wire it through the NO (normally open) position and it should be rated for 20a
 
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