Compression Ignition Addict
Join Date: May 2011
Location: Salt Lake City
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i saw this on another thread, dont know if it will help you at all... I'm not sure how much difference which terminal they (the sm. "coil" wires) use. BUT, here's how they work...
One of them has constant 12v going to it, the other is supplied ground by the pcm (completing the circuit and energizing the coil to throw the solenoid contacts and supply BIG current to the other lg terminal that heats the GlowPlugs)
SO, you have;
1 lg term with 12v (from the batteries)
1 lg term normally without 12v (goes to the GPs)
1 sm term with 12v (with the key on)
1 sm term normally without 12v (ground path to pcm)
Then when the pcm wants the GPs ON it supplies ground to the sm term and the two lg terminals then both carry 12v. The solenoid is really just a relay that converts a small amount of current (the pcm controlled terminals) switched into the Wopping 200AMPS the GPs draw.
LOTS of stuff works this way, it's the reason your fuse panel is so full of constant powered circuits, they are all controlled by supplying paths to ground instead of switching the power itself.....
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