US / North America

Alternator needs 12V to start


I have 8MR2070TA connected to a Sterling Products AB12130 Alternator to Battery charger. There is no output from the alternator in this configuration. The alternator works properly when connected directly to the battery. Does the alternator need 12V on its output before it will start?


Alternator not charging full amps


My alternator is not charging up to 60 amps. Starts at 60, but will not stay and drops to 30 or lower in a short time. I have looked at the photos on the website and the adjustment switch is not in the location shown. When using the battery charger it will charge it's full amperage, but when running the engine, the alternator will not charge at 60 amps. We are on a boat and are not able to receive and on hand advice or repair,if you could get back to us at soon as possible, it will be much appreciated.

Thank you

Steve Moen

alternator output & specs

Looking at the alternator on my 1993 Catalina 34 sailboat, I read 'Prestolite Electric Co. 8RC2008A 146A 12V 51 Amps.'
Is this a fixed voltage output, and if so do you know what this voltage is? Also if it is fixed, can a modification be made to make it an adjustable output to be able to get about 14.4 volts? How do I find the specs for this alternator.


Is 8RG2604 really a 4 AMP Alternator?

I was doing some engine maintenance and decided I needed to jot down the make and model of my Alternator on my 1981 Westerbeke 58. It's an 8RG3604 and it said 4 AMPs on it. Is that right? It really only outputs 4 AMPs or am I misunderstanding something?

Here's an almost clear photo:

Thanks in advance for helping out a newbie!

Alternator Poles

How many poles does the #LBA 2195(#A001090875) have ?

Why would I Go To A Higher AMP. Alternator

How Do I Know If I Need A Higher AMP Alt.

r1 terminal on 8sc3160v

I am installing the 8SC3160V alternator in a MCI model 8 bus that originally had a 50DN alternator. Can I use the R1 terminal on the alternator to power a 24v relay coil? In this installation, the relay has a set of N/O and N/C contacts. The N/O pass voltage on to another relay to power the heat and A/C fans which have been removed. The N/C contact sends power to an indicator lamp on the dash (NOT GEN) to indicate the alternator is not charging. I would like to hook the R1 to power this relay coil so the dash indicator lamp would work as designed.

Also, do I hook 24 volt power input to the IGN terminal on this alternator? Does this terminal need 24v in order for the alternator to generate power? The vehicle and alternator is a 24v system.

Thank you for your help.


I want to upgrade the alternator from 24 v 60 amp to a minimun of 100amp

I've a URO VAMTAC military vehicle it's like a AM GENERAL HMMWV wich use a AMA 5104 UT 60 AMP ALTERNATOR, and i need to install a new alternator of 100 amp minimum, that fit in the same bracket. Wich would you recommend?
I really appreciate your answer.

voltage regulator

I have a 200 Amp altinator with an adujustable remote mounted regulator Type number - R0015016 RC, Volts - 14, Date Code -74-41,

I am having voltage fluactions of about 3-4 volts. It used to just be at idle, but is not at all RPM and with different loads. The cables have been cleaned and same problem. Is there a way to confirm if it is the altinator or the regulator?

Thank you for your help


alternator poles

I have a leece 2800jb alternator, and i am replacing the tachometer. i have to adjust the tach according to the number of poles in the alternator,of which i do not know. i think it may have 12,but not sure.Any info would be helpful,thanks.