What is the standard output for the voltage on a 2004 TB130 Alternator? 13-14V ?

I BET IT'S 14 V's

I was thinking the same thing but when I was running it it was close to 18v and I said, I think the regulator is bad dude. he said that it normally runs almost 18v. just doesn't seem correct to me

I think 12.8 to 14.8 is normal, with 14.6 being optimal.  A fully charged battery is about 12.8v, and the readings should be at the lower end if the batteriea are charged.

What are you reading with?  If you are using the dash meter, check the actual alternator output with a multimeter.  Do it with the engine on and everything turned on, lights, A/C, fan, etc., being careful to stay away from moving parts.  Then check it at the other end of the alternator cable (disconnect switch or battery output terminals).  Any drop of more than .02 volts indicates corroded or loose connections.

Are you burning things up?

no nothings burning up, but the other operator replaced hr batteries recently. I'll check hr voltage with a multimeter. I was just monitoring the dash gauge only

BTW, this is really a Mack question. Putzmeister doesn't furnish the alternator.

The Telebelt requires 12 Volts, but the Ampere rating of the syatem is also a consideration.  The TB-130 has a 50A fuse for control circuits and a 50A fuse for the cooler fans.  I once checked a TB-105, and read a 30-35 amp load on each fuse.  The TB-130s with 2 fans might draw 35-40 amps, per fuse, but I've never had the need to check one. 

If you can find the rating plate on the alternator, it will probably indicate output in the 120 amp range, but I've never looked.  Mack sets the MR's up to Putzmeister specs.  We just mount the units and plug them in.

A little extra info.  Most multi-meters have a 10A fuse in the AMP mode.  Since ammeters must be in series, putting your meter in series with a battery cable would be ENTERTAINING, for a very SHORT time. 

Inductive meters, aka clamp meters, are available.  They clamp around the wire of the circuit you are measuring.  You don't have to disconnect anything.  They are not sensitive enough to read the 4-20 milliamp signals, in a Telebelt, but they are great for checking 30 amp fan circuits. 

If you go looking for one, make sure it will read DC Amps.  You can get AC Amp meters anywhere, but DC Amp meters are harder to find.  I bought my last one at Sears.  It has 40 and 400 amp ranges, AC and DC.  It will also read Ohms and AC/DC voltages.  I think I paid about $60 for it. 

I also have one from NAPA that has more ranges.  It was about $125.  I carry the Craftsman, because the NAPA one has an exposed On/Off switch that kept turning itself on in my tool bag.