Measuring Load cells
I would expect that you found the largest resistance was red to black, with the white wire being more or less the centre tap of the total resistance.

Load cells are not designed to be measured as resistance. While the resistance does change with load, it is too small to be measured reliably, and certainly too small to be detected above the noise and digit resolution on a standard multimeter.

It is designed to be measured by a Wheatstone Bridge



Your strain gauge comprises the two resistances R1 and R2, one increases, the other decreases with strain. You supply R3 and R4, and they are nominally equal. The output voltage proportional to strain is taken across Vg, with a high gain low drift differential amplifier.

Changes of strain gauge temperature will affect both resistors equally, and will not be measured at Vg. Changes of excitation voltage across A-C will affect the gain of the measurement, but will not add an offset.