Engine problem

So truck wouldn’t start this morning. I was able to get it jumped but it is not at full power. Dashboard lights were dim and nothing happened when trying to start car. Almost sounds like a ringing noise too around engine. Checked battery connections, fuses. Any thoughts?

 

What voltage is your battery at when running? If there’s a humming noise, try unplugging your alternator at the electric connector while running, you might need an alternator. If the noise goes away, then you might’ve found a problem, maybe.

 

13.4 while running

 

is the check engine light on? What truck is this?

 

2013 Tacoma prerunner 2wd v6. No check engine or warning lights. Autozone is checking now but driving here it doesn’t sound like engine is full power

 

Sounds like you need a new battery. If that doesn't fix it, then my vote is for new alternator.

 

Weak or bad batteries can cause many sorts of gremlin mayhem in heavily electronically controlled vehicles.

 

Both

 

See what your battery voltage is after sitting over night before you start it..

 

Figure it out?