Here's what they look like when new:
Solar 2175
130-amp MIG 208/230 volt - infinite heat and wire speed controls - 160 peak amps
Welds from thick, 5/16-inch steel to thin, 26-gauge sheet metal.
* Electronic wire speed control (0 to 700 inches per minute) and infinite heat control easily tune the precise speed and heat needed for the job
* Wire feed meter monitors wire speed for accuracy and easy reset
* Quick-release drive system allows easy wire change without additional tension adjustment
* Convection cooled (no fan) make it excellent for body shops
* Built-in spot/stitch timer lets you repeat spot (plug) and stitch welds
* Convenient purge/advance switches allow separate gas purge or wire advance for efficient use
* Small to large spool capacity makes wire more economical
* Excellent for welding stainless steel and aluminum
Comes Complete:
* Full welding cart
* High-quality, heavy-duty, 10-foot wire feed gun
* Ground cable assembly and clamp
* Assortment of contact tips (6 [.024], 6 [.030], 6 [.035])
* Steel welding nozzle
* Wire spindle adapter and spool tensioner
* Spare fuse
* Cable wrap brackets
* Easy-to-understand instruction manual
Here is where you can get some of the MIG gun parts:
http://www.htpweld.com/products/mig_gun_parts/solar.htmlWhen I zoomed in on the picture of the front control panel, i could'nt tell whether or not it had a polarity switch in the front because everything looked blurry but, it should have one!!! try looking in the back panel... If it does'nt, I personally would'nt recommend you to work inside unless you have enough experience in working with such equipment to change the polarity :) However, it can be done as long as care and SAFETY are the number one priority when working with this equipment.
Hope this helps and good luck in finding a user's manual unless you already have one :)
Respectfully,
Henry