V G wrote:
>> The test leads are a likely suspect. Broken strands at the
>> connections can cause the resistance to vary wildly.
>
> But regardless of the reading, the brightness stayed exactly the
> same. I think I'd notice a change in brightness if there really was a
> difference of 0.8 Amps.

I agree.  The fault is not in the test leads, since that would have to
actually change the current by a factor of 4 to get what you see.  However,
if the current shunt or something in series with it is flaky, then the
overall current need not change much to get very different readings because
you're dropping only a small part of the overall voltage in either case.


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