I was going to work today, it was 10 degrees F outside and after I've gotten around 4-5 miles the gauges glow stronger and the fan blows harder and I see the voltmeter above the usual 13-14volts.
It's nearly in the red, I turn off the heater and slow down, when I press the throttle it goes back to normal but it soon comes back again, this happens once or twice again and then it starts going really wonky, the voltmeter is going spastic flying between 13-15volts or so every second, this subsides after maybe 20 seconds and the alternator behaves normally for the remaining 3 miles of the trip to work.

I've just put in this alternator, a remanufactured CS-130 I bought on Ebay from a seller called starter-alternator.

Is the alternator bad, is it the cold maybe it is because I was almost out of gas(just noticed, maybe the engine started coughing)?

 

Sounds like its bad, the voltmeter working like crap is typical, but if the lights and blower are changing, then you have voltage loss and too high of voltage. Put a digital volt meter on the battery with the car running. you want approx 14.2 volts, anything higher than lets say 14.7 is too high, lower than 13 its not charging. Watch the meter and rev the engine up to maybe 2 grand, and see what it puts out. its typical at lower speeds to have a lower voltage, but not by much. at 2000 rpm, you should get 14 volts, if not, your alternator is done. Remain doesnt make it good, Ive went through several and carry a spare. Lifetime warranties are nice in the case of an alternator. Dont drive the car with the voltage fluctuating... youll fry your electronics.

 

The lights on the gauges yes, not any others, once it started flucuating up and down I didn't notice anything from the blower, maybe it didn't flucuate enough, it was only a volt or less.

the voltmeter has been consistently at 13-14volts since I put it in, today was the first something like this happend and today was also the first day it's been this bloody cold, I was wondering if there might have been a connection.

Well I couldn't exactly stop then, just drove slower.

 

It could be the cold messed with your battery, so the alternator was straining to charge it up. Dont trust the voltmeter in the car, go directly to the batter with a digital handheld voltmeter and see what you get up there. See if its jumping around, if not, just keep your eyes on it.