John Williams and 12 volts

[cardiffrob]

Thanks for the info, John. I've still got the length of heater wire you gave me for the job and will stuff it in today. By the sounds of it I can do away with the little bridging wire and instead run the resistance wire between the 2 cables via some extensions so the hot wire lives outside the casing. The RB is already in place and wired up from several years ago.
I measured 1.9 ohms once I had subtracted the resistance in the AVO meter so will use 4.1 ohms of heater wire (about 6 inches or so)

On the home stretch!