Alternator, charging and current draw

[Seangbadee]

I noticed recently that everytime my AC kicks in, I feel a power (current) draw, and the same thing occurs whenever I power my windows up or down.
I took some readings with only the engine running and the current voltage is in picture 1:




I put the lights, radio, AC, interior lights and the current voltage dropped as low as 13.98


I have a 143Amp alternator with my rebuilt voltage regulator in
Should I be concerned ?

 

[JC220]

13.98 is not low when the car has all accessories on IMO.

Looks to me like your alternator is doing a good job

 

[Seangbadee]

13.98 is not low when the car has all accessories on IMO.

Looks to me like your alternator is doing a good job

It’s still concerning that I feel the temporary the power draw; it feels like an ever so slight power drop.

 

[JC220]

Ref the voltage regulator, you call it a rebuilt one.

Do you mean a new voltage regulator is installed? If so, what brand?

Any slight 0.X Voltage drop when a high draw accessory is turned on is somewhat normal.

 

[JC220]

Example, if I have the headlamps on at night and I am watching them closely plus trip the window up switch I can see a small milisecond dip in the headlamp power. This is just normal behaviour and nothing to be concerned about.

If however you switch the headlamps on for a number of seconds (5+) and the voltage dips below say 13.5V then there is a potential alternator issue

 

[Seangbadee]

I will have someone switch in and I pay attention to the current voltage drop.
See my loyalty tags

 

[gsxr]

Those readings are EXCELLENT.

With stock 110A alternator you might see voltage (not current) drop below 13.0...

 

[Seangbadee]

Those readings are EXCELLENT.

With stock 110A alternator you might see voltage (not current) drop below 13.0...

Thanks. I’ll just leave it alone (for now)

 

[Seangbadee]

Those readings are EXCELLENT.

With stock 110A alternator you might see voltage (not current) drop below 13.0...

Thanks for the correction.

 

[gsxr]

Flip on high beams, fog lights, max HVAC fan speed, and rear defrost to really load up the alternator. I bet the voltage stays 13.5 or higher, which is still excellent for that much load. The 143A upgrade makes a significant difference.

 

[Seangbadee]

Flip on high beams, fog lights, max HVAC fan speed, and rear defrost to really load up the alternator. I bet the voltage stays 13.5 or higher, which is still excellent for that much load. The 143A upgrade makes a significant difference.

Okay, I will