Do you have an amp? If so, check the connections there, if not, and since they’re all going out, there may be a speaker adapter plug that goes from the factory harness to the aftermarket head unit, see if that’s loose.....usually behind the head unit. Even if one speaker’s connection is loose it wouldn’t cause the other ones to go out. Unplug and plug everything back in to make sure the connection is seated.
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'03 Ford E350 7.3L Diesel
(de)SMB'd Custom RB-50
Quigley 4X4 w/Deavers & Agile Offroad's R.I.P. package
CCV High Profile Pop Top
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