I am a welder by trade actually got sent to this site from miller welding forums,why is welding stainless dangerous? I do that from time to time too.
Yeah, that's yet another ICCP (Impressed Current Cathodic Protection) unit. Used in many industries for corrosion control. There was an article on the web about making your own truly functional system for under $30, along with some great advice on grounding, anode materials, electrochemical potential, and verifying the neutralization of the corrosion loop by a retired designer of the things. It was originally conceived for small parked or stored private aircraft with all their corrosion-prone aluminum, magnesium, wiring, etc. A quick search didn't find it but I'll keep looking and post it here.I checked on various sites and found (Car 4WD Rust Proofing with the CAT Electronic Protection System to be giving the rust process information in a very clear way. It also provides information about how rust protection system works and the benefits along with customer testimonials.
Worth checking out!