OK, here's what I KNOW.
Every supplier of electronic widgets (DigiKey, Mouser, etc.) that supplies schematics of said widgets shows a schematic for a 5 blade auto relay with an 87 and an 87A blade wired so that when you turn the key ON, supplying power across 85-86, you close the circuit between 30/87, and open the circuit between 30/87A. But when you turn the key OFF, you open the circuit across 30/87, and CLOSE the circuit across 30/87A.
I know that when I have used one of these relays as a car headlight dimmer relay, with high beams wired to 87 and lows wired to 87A, when the switch I have wired to be the dimmer is in the [off] position the low beams are on, and when I move the switch to the [on] position the low beams go off and the high beams go on.
Now, I have never run across a 5 blade that has two 87's so I guess I have something else to look for at the auto supply store.
Post edited by: pstrbrc, at: 2007/01/26 10:29