ON Circuit

Perform tests at amplifier 6-pin connector. See AMPLIFIER LOCATION table. Turn ignition on. Measure power circuit voltage between appropriate amplifier connector terminal and ground. See AMPLIFIER POWER CIRCUIT IDENTIFICATION table. Battery voltage should exist. If battery voltage does not exist, check for blown fuse and open wire from fuse panel.

AMPLIFIER LOCATION

Application	Location
Continental, Cougar & Thunderbird	Behind Instrument Panel, Right Side
Escort & Tracer	Behind Right Kick Panel
Mustang, Sable, Taurus,Tempo & Topaz	Behind Instrument Panel, Left Side

AMPLIFIER POWER CIRCUIT IDENTIFICATION

Application	Wire Color
Continental	Purple/Orange
Cougar, Mustang, Thunderbird, Sable & Taurus (Except 3.0L SHO)	White/Purple
Escort & Tracer	Black/Yellow
Tempo & Topaz	Red/Yellow

On Escort and Tracer, measure voltage between circuit No. 356 (Red/Yellow wire) and ground. On all other models, measure voltage between circuit No. 151 (Light Blue/Black wire) and ground. On all models, battery voltage should exist when cruise control ON button is pressed. If battery voltage does not exist, perform CONTROL SWITCHES test. If battery voltage exists, go to next step.
Release ON button. Voltmeter should indicate about 7.8 volts. Voltage should remain at 7.8 volts until another cruise control switch is pressed. If voltage is not as specified, check system ground, wiring, fuse and circuit breaker. Install a known good amplifier, and recheck circuit.