mistaken1
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The glow plug relay should have two large terminals. One is the feed (in a stock system it is coming from the resistor on the firewall). The other has the orange wires that feed the glow plugs.
When the truck is running and warm you should measure voltage on the feed wire but not the load wire (glow plug side). I do not have all of my pictures available.
When the truck is running and warm you should measure voltage on the feed wire but not the load wire (glow plug side). I do not have all of my pictures available.