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So if the ECU is blown, the ammeter would read zero? Is that the idea? If so, you wouldn't know which component was blown, though, would you?

Also, couldn't there still be current draw if one section of an ECU was open and another working correctly?

Oh - the chopper's back-ordered. <img src="/forums/images/graemlins/lol.gif" alt="" />

Frank

Frank Yes, if that paticular driver is bad you will see zero. Later vehicles allow you to active a circuit through the scan tool so you know what you are dealing with. In earlier vehicles, i just look at a wiring schematic and identify what else may be activated at the same time and disconnect those components, Actually a lab scope is the best tool as i can even find a working driver thats not pulling the component all the way to ground.
Hope that chopper makes it on time for hunting season.
Conner

Over the hill but still climbing.
88 Montero 2.6L auto, manual hubs, cooling fan conversion gps,recurved distributor,LSD Diff.