Here's what I got: weil mclain eg-45 steam boiler with sensit safeguard low water cut off honeywell pa404a1009 and honeywell s8610u. Want to add the common wire without adding a relay and another power supply if possible. The way that it's wired now seems to be wrong, but I'm just a master low voltage car guy, and don't want to mess up my furnace. The TH-W is going out from the s8610u and into the PA404 and then back to the Red thermostat wire. The White is connected to W on the transformer which is running out to the LWCO. I have a blue common that also runs to the thermostat. Nothing is on G or Y. I can post pictures tomorrow. Thanks
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