Bad Alternator?

[Will Rhoades]

I was running 22lbs of boost without any knock with Razors kit. I started to get knock and have noticed my voltage dropping. My voltage idiot light does not light up but I'm suspicious of my alternator. I got out my multimeter and checked the voltage on the battery terminals.
Voltage as follows:
@ start up idle = 14.52
With accessories = 14.24
After 30 minutes = 13.00
Alky test gain knob at 8 = 11.75
Accessories turned off = 14.27
I am under the impression that my current alternator is charging just not keeping up with my accessories. Therefore, causing my knock. This alternator was on my GN when I brought it. I believe it is a Powermaster (47806) 200Amp. Am I on the right track? Thanks in Advance.

 

[pmesfun]

Have the battery tested. I had a similar issue with the scanmaster reporting knock out of boost, fixed by charging the battery.

Sent from my SAMSUNG-SM-G920A using Tapatalk

 

[Will Rhoades]

I had the battery tested about a month ago. It passed and is fully charged

 

[robertf]

That voltage is too low for a 200 amp unit. It's stinks because Powermasters are not cheap. You may have a local shop look at it. Could just be the internal regulator going bad.

 

[Will Rhoades]

No kidding, This one looks to be over $400.00