Which wire colors does this alarm wiring diagram show being interrupted?

Two circuits: a PK/Y (pink/yellow) wire and a PK/LG (pink/light green) wire. Each wire connects to the N/C (normally closed) contact and the common of a switch inside the alarm box.

What connects to the N/O (normally open) terminals in this diagram?

Both N/O terminals are tied together and connected to a +12 V supply line.

How are the alarm relay contacts configured for the PK/Y wire?

The PK/Y wire runs through the normally closed (N/C) contact, so the circuit is complete when the relay is at rest; when switched, the common moves to the N/O side, which is fed +12 V.

Does this diagram show fuse ratings or part numbers?

No. It only shows the ALARM box, two N/C/N/O contact sets, PK/Y and PK/LG wire labels, and a +12 V feed.

Home/ Registry/ Ford/ Crown Victoria/ 1998-2011/ 1999 Ford Crown Victoria/ Photo supermotors.net/registry/media/447160

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

Wiring diagram of an alarm module showing N/C and N/O relay contacts with wire codes

‹ ›

Wiring diagram of an alarm relay with normally-closed and normally-open contacts, PK/Y and PK/LG wires, and +12V supply.

AI caption October 2006 · Photo 16 of 16

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.

Is this accurate? Sign in to help verify it.

Frequently asked questions

Which wire colors does this alarm wiring diagram show being interrupted?: Two circuits: a PK/Y (pink/yellow) wire and a PK/LG (pink/light green) wire. Each wire connects to the N/C (normally closed) contact and the common of a switch inside the alarm box.
What connects to the N/O (normally open) terminals in this diagram?: Both N/O terminals are tied together and connected to a +12 V supply line.
How are the alarm relay contacts configured for the PK/Y wire?: The PK/Y wire runs through the normally closed (N/C) contact, so the circuit is complete when the relay is at rest; when switched, the common moves to the N/O side, which is fed +12 V.
Does this diagram show fuse ratings or part numbers?: No. It only shows the ALARM box, two N/C/N/O contact sets, PK/Y and PK/LG wire labels, and a +12 V feed.