Installation guide

10
© 1999 Directed Electronics, Inc. N429 9/99
Type C: Reversing Polarity
Interfacing with a reversing polarity system requires either two relays or one 451M (not included).
It is critical to identify the proper wires and locate the master switch to interface properly. Locate wires that show
voltage on lock and unlock. Cut one of the suspect wires and check operation of the locks from both switches. If
one switch loses operation in both directions and the other switch operates in one direction only, you have located
one of the target wires. The switch that lost all operation is the master switch. If one switch works both directions
and the other switch works only one direction, you have a Type A system. If both switches still operate, but one or
more doors have stopped responding entirely, you have cut a motor lead. Reconnect it and continue to test for an-
other wire. Once both wires have been located and the master switch identified, cut both wires and interface as
shown below.
IMPORTANT! If these are not connected properly, you will send (+) 12 volts directly to (-) ground,
possibly damaging the alarm or the factory switch.