Strong engine noise through the speakers

2000 MAZDA PROTEGE
90,000 MILES • 1.6L • 4 CYL • 2WD • AUTOMATIC
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CARPS
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  • 1 POST
Hi, with no changes made, suddenly, a very strong engine noise sounds through the speakers. No have any amplifier nothing. Cannot hear the radio anymore, all you can hear is the engine noise. Could it be a bad alternator ? Thank you.
Jan 10, 2017 at 1:34 PM
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JOHNNY G.JR
  • ✓ASE Certified Mechanic
  • 320 POSTS
  • ASE Certified Mechanic
Grab a DVM, select A/C volts,check alternator for a floating A/C voltage,positive lead on post, negative lead on battery.
Jan 10, 2017 at 3:23 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Very probably an alternator issue, best to get it tested. also, make sure no earth straps have come loose or broken.
Jan 10, 2017 at 3:38 PM
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