Alternator Output

[Maxie Allen]

I installed a delco 10SI alternator on my 8N about 1 year ago according to the recommendations in the archives. I have had a little trouble with keeping my battery charged so I tested the alternator output with 3 different multimeters and they all showed 13 volts. I had the alternator tested at a alternator repair shop and they said good 14 volts. I reinstalled and it showed 13 volts once again. Has anyone out there had similar troubles? Thanks for any info.

 

[souNdguy]

If you used a consumer grade digital VOM.. ignition noise may have made it read wrong.. a cheap analog volt meter is better at this.

Did you install a correct 3 wire setup.. or the foolish trouble-prone 1-wire setup.

soundguy

 

[Dunk]

As Waylon Jennings would say lets get back to the basics...

What seems to be the issue we are working on, 13 - 13.5 volts are bragging rights.

Is your battery dead?

How old is it!?!?!?!?

 

[old]

Well if it tested good but you still have a problem then its either the way you have it wired or your battery is going bad

 

[gahorN]

It tests higher voltage at the shop because they tested it with a ground connected DIRECTLY to the alternator..... while on the tractor the ground is likely being found thru the mounting brackets to the motor, etc.
Run a grounding strap to the motor and from the motor to the battery ground terminal. (Watch polarity!)

 

[JMOR]

Are you measuring voltage at battery terminals OR directly from alternator terminal to alternator housing? Try is each way & that may shed light on subject.

 

[TimPa]

i am not positive here about the delco unit, but the rpm's wich it is being tested at may have something to do with it.