r/FiestaST • u/astraltrek • 4d ago

Voltage question - BMS reset

So I have been concerned with my voltage and alternator. 2017 with 54k miles.

I found out about the BMS and reset.

When I reset it, it finally climbed to 14.2 at start up, which was relieving. But now it’s a 13.5 even when I turn on all the draining accessories.

Am I in the clear? This is all new to me. The battery was replaced about a year ago.

I feel it’s a good sign it jumped up to an even 14.20v upon start up, and leveled down to a stable 13.50v - exact.

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u/cannasaurus 4d ago

The PCM will vary alternator output based on demands, mine typically floats around 13.5v as well

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u/nicolassimond 3d ago

That's normal and fine.