GM-46999-15 is an adapter harness that allows the use of GM-46999 AFM Tester on Gen V V6 engines. The Gen V LOMA has a different connector and wiring than Gen IV V8. GM-46999-15 has both Power and Resistance leads. The Resistance lead is connected between GM-46999 and the engine connector to measure the resistance of the individual LOMA solenoids before any disassembly, and the Power lead is used between GM-46999 and the LOMA on-vehicle to listen for activation, and off-vehicle to conduct an air test of the solenoids.