since it sounds like this could be attributable to your aftermarket install,take this question to the audio section and seek help from a guy that goes by the name SCLJA.i'd think he'd be able to get you on your way

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)