Howdy. The voltage in normal running has been slowly dropping over the last few months from about 14.3, now down to about 13.3 to 13.5 volts. Turning lights on and loading it up makes no difference. Battery voltage when not running is normal. It still has about 14.2 when first started, but drops as it warms up. Might this be the regulator on its way out, and can that be replaced, or is it likely the alternator itself is getting a bit ancient, like its owner? Is the regulator built-in to the alternator, or is it separate? Is it likely to completely clap out any time soon? How easy, or difficult, is it to replace? I haven't noticed any strange noises from it.


Cheers, Keith.

 

https://www.clublexus.com/forums/ls-...r-rebuild.html

 

I wouldn't worry about it. Voltage isn't what charges the battery, amps do. Both of my 430's run about 13.5v.

 

Mine runs about 13.5 as well once warmed up. It always starts around 14.2+ when cold.

 

Thanks Guys. It's just that it used to run higher. Yes, it is amps that charge it, so I will have to check that, but it appears to not be a problem, as it cranks fast, and starts fine. Battery is 4 years old, so it will have lost some capacity, so that might make a bit of a difference. Just have to wait and see what happens.

 

As a safety precaution I replace my battery every 3 years regardless of condition. From what I’ve observed alternator failure is not common. Mine has put out 13.4 volts for years without any problems.