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Relay question what is terminal 87A

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Relay question what is terminal 87A #1
Dinghyboy Gavin Dickie Henrico, VA, USA Sign in to contact	Topic Creator (OP) Mar 10, 2009 03:31 PM Joined 19 years ago 209 Posts

I have a Bosch relay, that has never been used but is not in the the original packaging. It has an 87 and an 87A terminal. Is the 87A terminal the same as *& or is it for a different purpose.

Thanks

Gavin

70 MGB-GT (driver)
76 MGB roadster (in progress)

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Re: Relay question what is terminal 87A #2
DB Wood Daniel Wood Bend, OR, USA Sign in to contact 1967 MG MGB GT 1968 MG MGB 1970 MG MGB GT	Mar 10, 2009 03:48 PM Joined 20 years ago 4,331 Posts

Terminal 87a which is the center terminal completes the circuit with terminal 30 when the relay is not energized, and breaks continuity when the relay is energized by putting 12v through 85 and 86 to ground, in which case the 87 through 30 circuit is completed. This allows you to do some interesting things with these relays.

Dan Wood
70BGT driver, OD, , HS4's, Peco, .060 over, Elgin cam, Superlite wheels, poly bushings, panhard rod, rear tube shocks, 1" lowered front end, HD shock valves, etc, etc.
68 MGB rebuilt engine D9 cam balanced, much more.
1967 MGB-GT project
2006 Saab 9-3 2.0T
2004 Dodge Ram 6sp with HO Cummins diesel
Lucas= Loose Unsoldered connections and splices

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Re: Relay question what is terminal 87A #3
78mgbfan Pat Harrison Memphis, TN, USA Sign in to contact 1978 MG MGB	Mar 10, 2009 04:18 PM Joined 18 years ago 257 Posts

What Dan said !!!

Here is a link to additional info on relays and some of their uses:

http://www.the12volt.com/relays/relays.asp

Pat

78 MGB
Weber DGEV 32/36
Lucas 25D Schlemmerrized dizzy w/Pertronix
Desmogged

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