Checking house wiring for high resistance connections
The distance and wire size would be needed to see if things are good. The formula is Voltage drop= 2K x L X I / Cm ... K for aluminum is 21.2 You will need to measure the lenth (L) and the current (I). You did not state the wire size so here are some values of circular mills (Cm). #14=4110, #12=6530, #10=10380, #8=16510, #6=26240, #4=41740, #3=5260. Doing the math after making the measurements you can see if the measured values are close to the calculated values. If your measured voltage drop exceeds the calculated values you may have some pigtails or connections that need to be cleaned and terminated with fresh anti oxide compound.
remember their can be calibration issues with the amp reading and voltage depending on the conditions. If all your measurements are within a few percentage points of the calculated value every thing is probably fine, If you find 1 that has a higher voltage drop than the average calculation that may be a place to investigate.