Amplifier Test

NOTE: Do not use a test lamp to perform the following tests as excessive current draw will damage electronic components inside amplifier.

Turn ignition switch on, connect a voltmeter to blue lead at the amplifier (middle terminal) of green connector. Voltmeter should read 12 volts when ON switch on steering wheel is depressed and held. If voltage not available, check horn relay circuit and control switch test. Release ON button, 12 volts should remain at blue wire indicating ON circuit is engaged. If voltage does not remain, check for ground on amplifier and/or install a known good amplifier and retest.
With ignition on and voltmeter connected to blue wire as in Step 1, depress the OFF switch on steering wheel. Voltage on blue wire should drop to zero indicating ON circuit is de-energized. If voltage does not drop to zero, perform "Control Switch Test". If switches test OK, install a known good amplifier and retest.
With ignition on and voltmeter connected to blue wire as in Step 1, depress the ON switch then hold Set-Accel button on steering wheel. Voltmeter should indicate approximately 10 volts. Rotate steering wheel back and forth and watch voltmeter for fluctuations. If voltage varies more than.5 volt, perform "Control Switch Test".