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Originally Posted by Treeman
...Now under closer inspection I see the wires have been in contact with wire that heats the plugs. Looks to have cooked them pretty good...
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The wires that you see don't actually heat the plugs, but they do glow... The wires are resistors, so they will heat up, but the loop of wire on the end of the plug is where the useful heating for the chamber occurs.
In an older 'series' or loop setup, the current runs through the first wire, through the first plug, through the second wire, the second plug, etc. Everybody glows!
The new plugs get 12V to each, in 'parallel' and the wires should not get hot at all.