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Johnnyb0

Member Since: 26 Jun 2013
Location: Ulster
Posts: 45

Switches?

Hello all, can anyone please explain to me why a switch has three terminals? Saw one on flea bay, then noticed that it had three terminals? I'm a total novice at automotive electronics. Oh, the switch has an LED warning light ob board BTW. Thanks. Johnny.

28th Nov 2013 11:12pm

Tiger

Member Since: 06 Jul 2012
Location: Wales
Posts: 2265

a One is Earth/GND

b One is Power (connected to a 12v fused power line)

c One is the Switched out.

When off b & c are not connected

When on b & c are connected and b & a are connected lighting your LED in the switch

28th Nov 2013 11:22pm

JWL

Member Since: 26 Oct 2011
Location: Hereford
Posts: 3443

No 1.....power source
No 2.....accessory/item controlled by switch
No 3.....earth, enables the led or whatever telltale to illuminate when the switch is in the on position.

Often it's up to the installer to find the correct combination which works

28th Nov 2013 11:23pm

Johnnyb0

Member Since: 26 Jun 2013
Location: Ulster
Posts: 45

Thanks Tiger. It's obvious when you think of it. Well, obvious when someone tells you how it works....lol

cheers Johnny.

11th Dec 2013 11:42pm

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