Posted by Steve@Advance on June 25, 2019 at 10:22:50 from (24.182.105.179):
In Reply to: 04 GMC 1500 posted by Rick n ohio on June 25, 2019 at 08:30:08:
Like others said, use an amp meter.
The amp meter MUST be connected in series with one battery cable and the battery post.
NEVER across the battery!!! Doing that will instantly destroy the meter or blow a fuse in the meter.
Be sure the ignition is off, all accessories are off, doors closed, hood light removed if equipped.
The reading may start out high and slowly diminish as things charge up and time out. That is normal. The amp meter leads need to be firmly attached, not hand held. Any loose or intermittent connection will start the time out over again, giving a false reading.
Once the reading is stable, start pulling fuses, one at a time until the reading drops to an acceptable level.
With each fuse pulled, when it is put back, the draw may temporarily go back up, then diminish, that is normal.
Which ever fuse drops the draw dramatically is the circuit that is causing the problem. From there explore whatever is on that circuit. Remember, you can't open any door while testing.
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