What's connected to RDO that can cause a parasitic draw (besides the radio)? (2000 GMC Jimmy)

Maintenance/Repairs
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1

I went through the whole multimeter/fuse test to determine where the draw was coming from.

The only spike I saw was on the RDO fuse (I tested all the others just to make sure).

After research I found that (unsurprisingly) the radio is the device connected to the RDO fuse. So I removed the radio. (It’s after-market, BTW)

But the parasitic draw is still present.

I haven’t tested if I still get the spike (should I?).

Is there anything else connected to RDO that would cause the draw?

Thanks in advance.

2

The RDO fuse powers the radio, instrument panel, and the electronic climate control module if equipped.

Tester

3

Suggest to post make/model/engine/transmission configuration.