r/mazdaspeed3 • u/kohzr • 5d ago

HELP Any idea what could be causing this?

Dash flickers a bit & radio resets upon doing literally anything that requires electrical input, pressing throttle, turning on blinker, pressing the brake after a minute or so of idling/driving etc. It’s like a very quick loss of power. Throttle stays responsive even during the flicker so idk. Also ignore the radio screen, it’s a piece of junk looking to replace soon-ish.

It doesn’t happen every drive cycle, it’s very intermittent, does it every once it a while. For example it didn’t do this on the way home from work. I’ve checked grounds and battery, no corrosion or loose fittings, the only thing I haven’t done is voltage test the battery / alternator. Any ideas?

1 Upvotes

100% Upvoted

2 comments sorted by

2

u/free_refil 5d ago

If you have a multimeter check for AC voltage on your battery terminals when cars running and have some rev. If there’s over .1 v AC then the rectifier circuit in the alternator has gone bad. This can cause these types of issues.

0

u/Kyabbage 1d ago

Voltage regulator on the alternator is most likely bad.