Hello all,

91' 3vze 4Runner here. Got some issue with the battery/alternator maybe. As I drive the dash light for battery lights up and stays for 10-30 sec then goes off. The funny thing is that as long as the light is on the meter for battery voltage is on max (ca. 18 v). When the light dissappears, the voltage drops to normal level (ca. 15-16 or around the middle of the right scale segment) Is this normal? What is the issue? Any help is appreciated, thanks!

Here you can see the arrow at max voltage.

 

Could be a failing regulator in your alternator or possibly something shorting across the regulator?

In any case, you don't want to let this go on for long. High voltage (18V+) is not good for the long term survival of 12V electronic components.

Jim G.

 

Oh boy, Thanks tor the reply, I will try to fix it asap.

 

Most auto parts stores will check the battery and alternator for free. I agree that the alternator could be having issues, but I have also seen failing batteries cause high voltage because the alternator is working harder trying to charge it. Another thing to check is all the wiring from the alternator to the battery (don't forget the grounds). If something is corroded or failing, it could cause intermittent problems. If the battery tests fine, remove the terminals and clean both sides well.

 

Thanks Supernerd, I'm on it!