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on my 59 3100 Apache, 12V with a Gen. had the 235 rebuilt this winter...it needed it. Now I am not getting 14V at the battery. Engine builder did NOT Polorize the regulator before starting, also did replace that part of harness from Gen to firewall.

Shouldn't I see 14V at the gen?? Only showing 12V at the battery.
Before I buy a new regulator, want to make sure it isn't something else.

Thanks,

The regulator won't need polarizing. The generator however does.Voltage at the battery will vary some. That is what the regulator does. At an idle the generator might not make much voltage. The advantage of an alternator is that it will. Nothing wrong with that on most trucks. Turn the idle up while measuring the volts at the battery. If the volts comes up to about 14.5 you are fine. If not, recheck the wires to the regulator and the generator. This Tech Tip will help: http://www.stovebolt.com/techtips/electrical/electrical.html
You will get it fixed. Enjoy