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· Administrator
2002 F55 STS, 2014 Explorer XLT, F-150
80,436 Posts
Don't forget that the OEM system uses special low impedance speakers. They're NOT your stock 8 Ohm or 4 Ohm aftermarket units.

Go down to Cadillac Technical, Audio/Alarms. Probably more answers there......

Get on eBay and find a Helm GM Factory Service Manual set.
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