Though the degree of cooperation differs between alliances, airlines alliance is more helpful for small airlines. There are three major international airline alliances namely SkyTeam, Star Alliance and Oneworld. One of the modern alliances is that formed by cargo airlines.
The top terminal should be connected to wire #18 (low beam), the bottom right to wire #17 (high beam), and the bottom left to wire #91 (headlight to ground). I purchased my lights from a local shop, but I found that Susquehanna Motorsports has a web page with competitive prices and a nice write up about the lights.
How to Test a Four Terminal Relay. A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. For example, a low power circuit in a car that commands the high power headlights to come on would send the command through a 4 terminal relay. An ISO micro relay has the control circuit connected to pin 86 and pin 85, and the load circuit connected to pin 30 and pin 87 or 87a. 2  There will be only 1 second load pin, 87 or 87a, not both. 3  Read the relay connections printed on the relay.