1999 Ford Crown Victoria Alarm Wiring Diagram - PK/Y & PK/LG Relay Hookup

This is a simple hand-drawn wiring diagram, uploaded as 'Alarm.JPG' for a 1999 Ford Crown Victoria, showing how to interface an aftermarket alarm's relay outputs with vehicle wiring. A box labeled 'ALARM' contains two single-pole double-throw (SPDT) switch/relay contact sets, each with N/C (normally closed) and N/O (normally open) terminals. The first contact set: the N/C terminal and the common terminal each connect to a PK/Y (pink/yellow) wire, meaning the PK/Y circuit passes through the normally closed contacts. The second contact set: the N/C terminal and its common each connect to a PK/LG (pink/light green) wire, so that circuit likewise passes through normally closed contacts. Both N/O terminals are tied together to a +12 V supply line, which crosses over the PK/LG wires (shown with hop/jump symbols) without connecting to them. Functionally, when the alarm triggers the relays, the PK/Y and PK/LG circuits are opened and the commons are instead connected to +12 V. A reader can learn the intended contact configuration (N/C in-line with the PK/Y and PK/LG wires, N/O to +12 V) for this alarm installation. No part numbers, fuse ratings, year/model statements, or connector pinouts appear in the document.