Voltage regulator

[clydethepirate]

Noticed today that the amp gauge on my 04 jeep grand cherokee was jumping around. It used to run on 14 volts and now its going under and over 14
I put my meter on it and it was showing 14.25 volts.
Is that a normal reading or too high.
Thinking the voltage regulator may be out.

 

[Jester32]

That's about normal. 15v is max. But if it's jumping around could be reg or diode. Check all you connections and grounds at alt and batt.

 

[clydethepirate]

Both are inside the altenator right?

 

[MY95YJ]

The regulator is in the ecm on those.

-James

 

[clydethepirate]

Whats the ecm?

 

[Jester32]

Engine control module. PCM.

 

[clydethepirate]

Located on the firewall? should I just change it out?

 

[Jester32]

I wouldn't unless it's proven faulty. Check your connections. Very seldom will ECM fail it just turns the windings on and off as needed. I would stray more towards a diode in the alternator or a connection.