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<blockquote data-quote="Papermaker85" data-source="post: 5260134" data-attributes="member: 572595">your cars CPU usues logic controls and uses a process called ladder logic. through sensors and relays certian things happen when the CPU see a given input... depending on your alternator/cpu wiring configuration, it could be a problem with the voltage regulator or rectifiers... if its a retificer problem you could read a AC voltage from the alt or no output at all..&nbsp; voltage regulators sometimes cause spkies or dips in voltage even when there is no load.. or a constantly high/ low voltage.. and its hard to identify because some cars have timed relays so when you start your car the alt charges at a higher voltage to recharge the batteries then lower back to a acceptiable voltage VIA the resistance its reads from the batteries... also it could be trying to adjust from the different ISRs in the different batteries also(voltage regulator)...this is why some manafactures don&#039;t recommend you use different batteries..i would suggest no higher than 15.5 for short periords and for a normal charge no more 14.5 volts.... most of the voltage regulators have timed relays that will close and tell the alt charge at a higher input parameter(in your cases 14.4) when it sees the voltage has dropped past a certian point.. for instance when your start your car.. then it will simply open again and hte voltage regulator will lower the voltage&nbsp; to prevent over-charging the batteries..&nbsp; in your case i wouldn&#039;t worry about it if its 14.4, but if you see it jump to 15+ i would take it to the dealer to get the voltage regulator adjusted and use just one type/brand of battery there after..</blockquote>

[QUOTE="Papermaker85, post: 5260134, member: 572595"] your cars CPU usues logic controls and uses a process called ladder logic. through sensors and relays certian things happen when the CPU see a given input... depending on your alternator/cpu wiring configuration, it could be a problem with the voltage regulator or rectifiers... if its a retificer problem you could read a AC voltage from the alt or no output at all.. voltage regulators sometimes cause spkies or dips in voltage even when there is no load.. or a constantly high/ low voltage.. and its hard to identify because some cars have timed relays so when you start your car the alt charges at a higher voltage to recharge the batteries then lower back to a acceptiable voltage VIA the resistance its reads from the batteries... also it could be trying to adjust from the different ISRs in the different batteries also(voltage regulator)...this is why some manafactures don't recommend you use different batteries.. i would suggest no higher than 15.5 for short periords and for a normal charge no more 14.5 volts.... most of the voltage regulators have timed relays that will close and tell the alt charge at a higher input parameter(in your cases 14.4) when it sees the voltage has dropped past a certian point.. for instance when your start your car.. then it will simply open again and hte voltage regulator will lower the voltage to prevent over-charging the batteries.. in your case i wouldn't worry about it if its 14.4, but if you see it jump to 15+ i would take it to the dealer to get the voltage regulator adjusted and use just one type/brand of battery there after.. [/QUOTE]

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