Look in your manual for tha amplifier. If it states that you have a soft turn on or silent turn on then any 12 volt accessory wire would do. This is common relay on almost all recent amplifiers. The only problem with the antenna booster is that it may not stay on during cd playback. Some cars have it active with the radio while others only stay active with the radio input. If you have a meter then just see if a 12 volt signal is present on the wire after switching sources. Some of our newer radios are pretty advanced. The new GM models are required to have a windows based flash to upgrade the firm ware. these will shut off all 12volt sources that are not in use to eliminate noise in the system.
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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