Current draw of ECM when the engine is off

[workingdog]

I searched and could not find anything. I'm having battery draw down problems.

What should I expect the current draw of an ECM to be for a 2001-ish ECM?

When I connect the ECM back to power via the meter, does it 'wake up' at all?

Thanks

Peter

[Earwax]

What is your current draw in Milliamps?
With and with out the ECM in the circuit?

[workingdog]

I got 100 milliamps with everything connected, ignition off. I need to go back out and pull some fuses. I was wondering what I should see with the ECM asleep.

[Earwax]

That's a dead battery shortly.
It should be fairly easy to find.
The ECM draws a very low current.
I have never had to check a ECM for a current draw.It is always something else drawing.
I last checked a 05 Silverado and after the BCM and other modules went to sleep, it had 6 Milliamps of draw.
GM once stated that anything over 40 Milliamps draw, the battery would need recharged after 3 days of non use.
It was actually published in the early 2000`s for the Corvette and Cadillacs.
Ideally, it should have 0 draw. The older non computer,module equipped cars would read 0 draw.
These days are long gone, 5-9 Milliamp draw is normal according to GM on a Silverado.

[workingdog]

Thanks so much, that is a huge help. Time to find someone to hold the voltmeter why I pull fuses.

[gofastwclass]

Workingdog, I use a set of mini jumper cables I made using small alligator clips soldered to a length of 12 gauge speaker wire for occasions like this. This way my meter can be placed anywhere I need it to be and remain connected to power. They are also good for quickly providing power or ground to something for testing purposes.

[workingdog]

Yes, I need to do exactly that. The fact that this is a conversion and the fuse box is just about impossible to fiddle with and the wiring is a mess doesn't help.

Peter

[workingdog]

So, not that I didn't appreciate it, but that was the wrong advice. I was getting 100 ma draw through the alternator! Diodes are shot. I had disconnected the cab from the batter before it finally occurred to me. So, time for a new alternator - nice big one. When I get it in, I'll run the test again.