Basically my cars heater blower used to work intermittently then decided to stop altogether. Done the usual reading up online and found out about the final stage resistor common issue. Anyway turned out my car didn't have the usual resistor but a small square item with 3 coiled springs inside that clips onto the side of the heater box with a plug attached with 4 wires, see below pics

So I replaced this with a new item, problem not resolved. Testing my old one and it's fine so that wasn't the problem. However I stuck the multimeter onto the plug pins and there is no power coming to the plug on any blower speed. What would be causing the break in the electrical circuit? I checked all the fuses they are fine also. Please don't tell me it's the motor