No output from lincwelder 225 DC

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Hi all, hope someone can answer this one for me. I got a 1962 Lincwelder 225 DC that I tore down and rebuilt. I have been working on this machine off and on for a couple of years now, just got back into it again and am still stumped at why I am not getting any output at the weld terminals. Here's the breakdown for ya:    -pull start or push button with the aid from two 12 volt batteries connected in series. starts fine, runs smooth. I opt for starting it with the button and I understand that this creates the small residual magnetic field that is supposed to be built up after the machine starts     - checked all wires individually, continuity through all wires. hooked up one by one and checked continuity each time, all o.k. there. Doesn't appear to have any continuity where it shouldn't be.     - Checked the resistance grid, everything seems to be continuous there.     - the armature is clean at the brush location and all brushes are clean and have good contact and flow     - checked the ohms between the negative side at the brushes and the rheostat, under 40 ohms which if I'm not mistaken means that the shunt coil is O.K.     - I get about 1 volt AC at the aux. oulet at idle, goes up to 3 volts AC when I rev the machine up, I disconnected the battery pos. side to make sure that the battery wasn't providing the power-it held at 1 and 3.     - I get about 1 volt or under DC at the weld terminals. it goes to 0 when the machine revs up.I have had this machine apart a couple of times and as far as I can tell all wires are where they are supposed to be according to the wiring scheme. Anybody have any ideas on what might be overlooked or something else to check? I'm trying to avoid taking this one in to a shop, this is my baby and I've taken quite a bit of pride in restoring it, hence I'd like to do all the repairs myself, and learn about a thing or two along the way. Thanks for any help you guys have given and continue to throw my way, It's greatly appreciated!