Originally Posted by
Steve '92ES
True, but transistors don't have to be absolute on/off switches. They can be partially on, like in an amplifier. It's feasible that they could be used to limit current, but in this case I doubt there's any operational function to it. More than likely it's done that way to protect the PTU if a coil shorts out. In other words if, for any reason, the coil starts drawing more than 6 amps the transistor is biased off, limiting the current. On the other hand it would make no sense at all to use a 10 amp coil and limit it to 6 amps...
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