Originally Posted by 2013FSport

#2IS ElectricalIn the most forward 12V accessory port I placed a USB charger with a volt meter on it. Here are a couple observations.1) After sitting over night the system voltage hangs around 13.8 - 14.1 volts for about 10 to 12 minutes.2) After 12 to 15 min. it settles to 13.4 - 13.6 volts no matter what accessories are turned on.3) Any warm start after meeting the 15 min. run time, results in line #2 and the alternator settling at 13.3 - 13.6 volts. Temps are in the 30°F here and have been warmer and colder, the same pattern repeated for weeks. I think this battery is at the 4 year old mark so it is time to keep an eye on it.

Originally Posted by 2013FSport

This is the thread I was looking for. OP, I installed one of the volt meter USB chargers mentioned above and have some information for you from a 2013 IS350.

It also seems the system charges at a higher voltage/current based on something to the effect of time off.

I'll post back if something changes regarding details above.

Originally Posted by salimedwrd

Originally Posted by JaredAU

Thanks for the follow up! What do you mean it charges based off the effect of time off?



Nah I didn't end up damaging the TB. They're pretty resilient from what I've heard. The problem was the alternator and posted somewhere up there in the comments with a summary. Thanks for the comment.

Originally Posted by 2013FSport

Just that charge voltage >13.8V for the first 15min on cold start, then levels off.

Originally Posted by Yodog

What odb2 app n device do you use?