Relay internal functions
 

Need to know the internal functions of the common 911 electrical relay(30-85-86-87).Thanks.

30 is battery positive voltage
87 is a relay actuated contact
86 is the coil control voltage
85 is coil ground

Here's typical Bosch DIN relay, 1 make, 1 break type. 87a is typically not included on the round relays; used to break a circuit when the relay is energized. Othewise, the function is the same.

http://forums.pelicanparts.com/uploa...1180472784.jpg

86 is also source voltage. When switched, it energizes the magnetic coil in the relay, then to ground.

Sherwood