Voltage into car battery

[Ray Bush]

Hi I have a 2013 Toyota Yaris 1.3 petrol and have a question -

When the car is idling what voltage figure should the alternator be putting into the Battery .I recently had a new Battery fitted and noticed that the car is a bit sluggish when being started ,it could be that I don't do that many miles per week now ,but just wanted to make sure .I put a voltage meter on the charging leads from the alternator to the Battery and on idle got around 14/15 volts and wondered if that was ok ,obviously ,over idle speed it should be a bit higher …….or am I wrong !!

[stantheman1]

Should be approx. 12.9 to 14.1 volts, 15 volts is too high and eventually will damage the Battery.

[Mooly]

Have a read at this post of mine and posts I made following this:

 

[martswain]

The minimum voltage required to charge a Battery is 13.8

Ideal range is 14.2 to 14.5 v

It should not be above 14.7 v 

Info is here

https://www.w8ji.com/battery_and_charging_system.htm

 

[wildtapholer]

Just replaced the wifes Battery and when started it ran rough and tick over was only 500rpm once the ecu picks up your driving style the rev's will settle down to about 1000rpm when first started and around 750 when warmed up.