Thanks everyone. I just wanted to make sure I understood the wiring. The replacements I received say "WELLMAN 6A477G017 V11" and they match the ones I took out. I'm pretty sure my problem was due to overvoltage, since I was using the charger's boost setting trying to get the engine spinning at good speed at 25 degrees. The boost made the engine spin fast enough, but when it didn't fire, what's when my folly started to dawn on me. Afterward, I used a multimeter to measure the resistance of each plug and they all read open.
I've only had the 656 two years, so who knows how old those glow plugs were that I took out.
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