Alternator voltage

Howdy fella's and fellettes.

Just had the lovely experience of my battery stone cold dying in our cool 102 degree weather we have today, and after waiting for just a short two hours or so for AAA to come and replace my battery the guy told me that my alternator was running at a low 13.9Vs and told me to get my alternator checked out.

I just want to know what the alternator should be reading. Is 13.9 low? normal? Should I stop typing and got the hell to a dealership?!

I'm poor at search so I apologize if this was discussed and I missed it. Just point me in the right direction if so.

 

Here ya go: http://www.customtacos.com/tech/files/05FSM/data/ileaf/06toyrm/06toypdf/06rmsrc/rm2006ta/02400.pdf

 

Thanks much, so it looks like I'm fine.

 

Mine runs 13.8-13.9. Very annoying for us RV'ers, as this drops to 13.6- 13.7 with the trailer hooked. It does not charge the trailer batteries hardly at all. Very annoying. 14.4 was the norm in every other vehicle I have owned.

 

Well that makes me feel better that I'm not the only one. I guess that explains why the guy thought I was so low if we tend to run lower than the norm. I don't ever pull anything, so it sounds like I'll survive.

 

I pulled my travel trailer with elec brakes, smelt some burning..got home otherwise. few days later batt light came..now no signs/lights on dash when i turn key..i am in the process of rebuilding the alt..probably will get it done for 140 or 150 amps.

 

13.9 Low?

My SGII is usually telling me 14V when I first start the truck in the morning, after I've been cursing down the highway to school in the mornings, my reading is usually in the upper 13V. Lowest I've seen is 13.5V.

 

That's what the guy told me. Figured I'd check with y'all before I got concerned about it. Sounds like he just wasn't familiar with the Tacoma.

 

if the battery was dead there will be a greater load so 13.9 sounds perfect

 

Voltage is also going to depend on temperature. Higher temps, lower voltage and vice versa. It's due to lead acid battery chemistry.

 

Yeah, it was mid day in South Florida so it wasn't cold. All good advice. Thanks guys. I'd buy you all beers, but yanno . . . just had to buy a new battery.

 

Is there an index/glossary for those customtacos links?