Seller Notes: “The item is in good working condition, it will work for E28 E30 85-91 325e 325i 82-88 528e 535i 77-87 733i cars by part number 1374613. Thank you for buying from us.”. Type: Relay . Manufacturer Part Number: 1374613. Brand: BMW.
Q2: You can connect the stock wires to the relayand85and86 are interchangable. Q3: Yes, ground directly to the frame. Q4: 14g is fine for the ground on the relay. 14g should also be fine for the horns if you ground them close to the horns themselves. Is there any reason to run the ground wire 5 feet?
Arelayis typically used to control a component that draws high amperage. The relay allows full power to the component without needing a switch that can carry the amps. The switch only controls the relay. The relay then provides a direct connection to the battery. It should be noted that either the power (86) or ground (85) in the relay ...
So in this case, if you weren't seeing a Ground at relay socket 85 (lights on), you'd want to "back pin" the wire at Pin 14 at the BCM's connector and see if it's providing the Ground there. No. It means you have an open circuit in the relay coil ground. If you connect a jumper wire from ground to 85, then the relay should energize.
Numbers of a Relay. Looking at the diagram, we see the pinout of a typical 12V relay. Note that each pin is numbered. 85 and 86 are the coil pins while 30, 87, and 87a are the contact pins. 87 and 87a are the two contacts to which 30 will
So the red on the safety switch would plug into the relay (85 or 86on the relay) - when safety switch is closed and power was going through it, power will be delivered to the relay (which would trip it) and then the relay could supply power to the high amerage device (fuel pump in this case) through it's 30 (in) and 87 (out) terminals.