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Message: <blockquote data-quote="cdmccul" data-source="post: 127367" data-attributes="member: 9318">It's my impression that diesel glow plugs would fire on every start....Also, glow plugs often do not run at a full 12 volts, they run at more like 8 volts. Also, they are a variable resistance...the warmer they are, the higher the resistance.  So, in Los scull diesel, you cycle the key. The glow plugs get power via the relay. The power then goes to a lamp in series (causing a voltage drop) them to all 4/6/8/etc glow plugs in parallel. As each glow plug warms up, the resistance goes up. When the last glow plug warms up to infinite resistance, the glow plug light goes out, signaling to you too crank over.But I'm not sure what the BOSS is doing, in this case. Do you have main (12 or 8/etc volts) power to the relay, and no signal triggers the relay, or do you have a signal to it, but no main power for it to switch?</blockquote>