Originally Posted by deputy5211
Now that I understand what relays do, I bought some relays to make a circuit hot only when ignition is on. Will sense the seat heater for this. Now, I need to know how to hook it up.
The relay is identified by screen printing on the front as Y41A-1C-12DSM
Can anyone decode the posts on the back for me? What goes where? Posts are identified as:
. . . 87
86 87a 85
. . . 30
(NOTE: Dots added for spacing only)
Hoping I don't have a senior moment here:
85 and 86 are the relay coil. One to the source of switched power and the other to ground.
30 is feed from the battery positive. (preferably a fused line.)
87, 87a is the power out from the battery terminal (30)
Not sure of your relay, sometimes 87a does not exist. If it does it usually is a normally closed contact set (NC) and is live until the relay coil is energized.
87 is a normally open contact set that becomes live when the relay coil is energized. This is the one you will probably be using.
Sometimes 87a is parallel to 87 and will only be live when the relay coil is energized. ( I think that is done to increase the load carrying capacity of the relay.)
You will have to take a meter or test light and figure out the configuration.
And reading your relay description, yours is rated at 30 amps NC (normally closed term 87a)
and 40 amps NO ( normally open term 87)