Where should my volts be on scanmaster ?

[gnxjames548]

Just put new alternator on car & it seems like my volts dropped on my scanmaster.I need to know what is the norm for volts to read on the scanmaster.

 

[garyk1970]

there are alot of factors; state of charge on batt,idle rpm,etc

went out and checked my car for you; 13.9 to 14.2 at 850 rpm. (my battery is low)

normal should be 13.5 idle park no load (lights,etc). 13.4-14.3 2000 rpm driving. keep in mind these are normals,not what everyones car is going to do.

 

[garyk1970]

my opinion is if an alt cannot keep your battery atleast 12.9,then check battery and alt condition.

 

[gnxjames548]

Volts

Thanks for your response. With the old alternator at 2000 rpm I was at like 14.2 to 14.4. Know with new one I'm at 13.7 at best bet usually at 13.4 to 13.2 No more 14's Is that ok or should I try another alternator from advanced auto it's a stock 120 Amp.

 

[garyk1970]

no, youre good.just sounds like the battery is fully charged,so the alt isnt maxing itself out. im going to assume your car sits a few days at a time like mine does,after a couple of days sitting ,your battery volts will drop slightly and then you will see the higher numbers as the alt charges the batt back up.....

 

[gnxjames548]

Yes my car sits for weeks at a time On my way to change the alternator it was reading over 14 Know its mostly 13.4 / 13.2 That is Ok ?

 

[garyk1970]

try this; start car and monitor voltage while slowly turn on ac,then lights,rear defrost,etc and make sure voltage doesnt drop (this test at idle)......

 

[gnxjames548]

Ok