Found out these are not original 3m but a cheaper fake. The metal protrusions are very weak and often flex rather than penetrate the wires, resulting in no contact or intermittent contact. I had to replace a few wires that weren't pinching or cutting into the wires I was trying to splice. I've been using these types of connectors for years, so the problem isn't how I use them, just that they have weak stems that just bend and won't go into the wire housings. I have installed car alarms in the past and have used thousands of connectors of this type. I will not order this brand again. Pay a little more and get a higher quality 3 meter faucet.
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