Battery/Alternator issue potentially? Please help

[Jager]

Originally Posted by amitmishra4

I see. From my earlier test yesterday, Battery Voltage when headlights and blower are turned on: 13.4 V. Radio is not working since my battery first died and I got a jump.

I took the alternator outside the vehicle to pepboys and they just popped it in the machine in the back and did a test, they didn't really tell me what test but it sounded like basic functionality.

I will take it back to them installed in the car now and ask them to do a load test.

You are performing a load test by turning-on all the electrical accessories and measuring the voltage across the battery terminals. At 13.4V your battery is still getting charged.

I just thought of something... Does it change (drop) when the RPMs are increased??

[epapp]

Originally Posted by Jager

You are performing a load test by turning-on all the electrical accessories and measuring the voltage across the battery terminals. At 13.4V your battery is still getting charged.

I just thought of something... Does it change (drop) when the RPMs are increased??

Jager, what would it mean if the voltage dropped when load testing and increasing RPM?
Thanks

[Jager]

Originally Posted by epapp

Jager, what would it mean if the voltage dropped when load testing and increasing RPM?
Thanks

I have seen alternators on GM cars that had proper voltage at idle but the voltage would drop when RPM's increased... Bad alternator.

[Tucker2]

Figure out that hum?