Yes, it was reading 12.3VDid you measure the voltage at the peltier while connected to the battery?
The module was attached to a heat sink with thermal adhesive, hot side to the heat sink. I removed the heat sink from an old motherboard. It has a working fan and was on. The leads were the original leads that comes off of the peltier module.Were you keeping the hot side cooled down so that it didn't turn to toast? How long were your leads?
The leads are only about 8 in long coming from the module. The voltage was measured at the same time as the current, yes in series. Another test was just done with the same result. I connected the module to a 12v 10a supply I know is good and same reading as before except the voltage on the supply was 12.1 as the current meter read 2.34a. I am wondering if the modules are mislabeled. I bought 4 of them and they all do the same thing.Hmmm... Unless we're missing a critical piece regarding your test, I'd say you have a faulty TEC.
But just to clarify, your TEC leads are a few inches long and, with a voltage of 12.3V at those leads (measured with a second meter), you saw <3A being drawn through the first meter, which is in series with your TEC? Can you check the voltage across the meter that is measuring the current, while the TEC is running?
I am going to order a few more from a different source. Thank you very much for your help. I will sign off.My 12709 modules draw ~4.5A when supplied 5V. So something is wrong.