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Mini Relay vs Automotive Relay


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chicagohh 
Member - Posts: 2
Member spacespace
Joined: June 14, 2005
Location: United States
Posted: June 14, 2005 at 10:34 AM / IP Logged  
I have a 12VDC mini relay from Radio Shack - part 275-248 (5 terminal). I would like to see if I can use it for a project instead of the Bosche type automotive relay that I currently use.
The terminals are not in the same positions as the automotive relay and I keep making sparks with my lame experiments.
Here is the layout of the mini-relay -
Mini Relay vs Automotive Relay -- posted image.
Which terminal are which?
30 = ?
87a = ?
87 = ?
85 = ?
86 = ?
Thanks,
Joe
Mad Scientists 
Silver - Posts: 380
Silver spacespace
Joined: February 07, 2004
Location: United States
Posted: June 14, 2005 at 4:28 PM / IP Logged  

Using an ohmmeter, probe around until you find two pins that have a resistance of about 400 ohms. This is your coil

Of the remaining three terminals, you should find two are connected together without powering the coil, and the remaining terminal should be connected to one of the previous terminals (NOT the coil terminals) when the coil is energized.

Helpful?

 Jim

chicagohh 
Member - Posts: 2
Member spacespace
Joined: June 14, 2005
Location: United States
Posted: June 14, 2005 at 5:12 PM / IP Logged  
Very helpful.
Thanks Jim.

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