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Strong engine noise through the speakers

Tiny
CARPS
  • MEMBER
  • 2000 MAZDA PROTEGE
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
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.
Tuesday, January 10th, 2017 AT 1:34 PM

2 Replies

Tiny
JOHNNY G.JR
  • MECHANIC
  • 320 POSTS
Grab a DVM, select A/C volts, check alternator for a floating A/C voltage, positive lead on post, negative lead on battery.
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Tuesday, January 10th, 2017 AT 3:23 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Very probably an alternator issue, best to get it tested. Also, make sure no earth straps have come loose or broken.
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Tuesday, January 10th, 2017 AT 3:38 PM

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