Over charging issue

[Chuckanut]

Hey guys I rebuilt gen1 for the fourth time in a row and finally the light went out after turning the key and the tach works again but the resting voltage of the truck is 34 V when I first stop the truck when it’s running today at measured 40.8 V and the voltage gauge is in the green and the lights aren’t on for the alternators what’s going on?

 

[87cr250r]

I think your multimeter is failing.

 

[NDT]

Could be the regulator in the other alt failed

 

[87cr250r]

The resting voltage of a lead acid battery is 25.2 volts. If your meter is reading higher after a period of resting the meter is bad.

 

[WWRD99]

The resting voltage of a lead acid battery is 25.2 volts. If your meter is reading higher after a period of resting, the meter is bad.

It does point to that! I haven't seen one out that bad though...10 volts is a ton!! Be curious to see.

 

[87cr250r]

I'd rather it be off by a lot than a little. That way you know something is wrong.

 

[reloader64]

Check all the connections back to the battery. I had a bad connection on GEN1 and it would go over 50 volts at the alternator. Repaired the connection, now it reads 13.8 at the alternator. Also, have your batteries tested. A bad battery will cause some weird readings and behavior.

Scott