Quantify "significantly better"...
Again? %) That's what the past 30 posts in this thread have been about.
...measure the resistance with a multimeter.
You STILL don't seem to understand what "dielectric" means. It's NOT a synonym of "resistance". You can't determine what's dielectric & what's not with a multimeter. It's a molecular quality.
...dielectric grease does NOT conduct electricity...?
Did you NOT follow the links I posted for you? Look in post #51. Dielectric ANYTHING does not conduct electricity.
...if you pit it between two points of contact that it will not make a connection?
Now you're just being confusing. I can put a plate of steel between 2 other things. Whether or not those 2 things still make contact with each other depends on a LOT of factors. Like how much force they apply toward each other, and whether or not there's any movement relative to the steel plate. If, let's say, they're the carbide cutters on a brake lathe, they won't touch for a while. But eventually, they CAN make contact again after they cut through the steel of the brake rotor. Same for putting dielectric between terminals - the terminals MIGHT still make contact DESPITE the grease, depending on how much force the terminals can maintain toward each other. But I don't recommend you put things on your eB that it might work IN SPITE OF; I recommend you put things on it that HELP it keep working right. Like dielectric grease on the spark plug boots, the rubber or hard plastic of the connector shells, and the caliper slides if it has disk brakes. For electrical TERMINALS: electrical grease. It will also help the spark plug boots & connector shells, if you don't have or want to use dielectric there.
Lets say if you put dielectic grease on the copper ring horn contacts of the ford horn to prevent wear, the horn will no longer work?
Depends on the force/pressure/abrasion/viscosity... Most likely (as you already know) the horn WILL still work. But NOT because the grease is conducting any electricity, and not because it's helping. The contacts will still make contact because they're among the heaviest, highest-pressure abrasive contacts ever used on a consumer-grade machine. If you put house paint on the rings & wipers, and let it dry before mounting the steering wheel, they'd eventually make contact, and the horn would work (after the paint wears away). That DOESN'T mean house paint is good for electrical connections. Neither is dielectric grease, even though the horn will probably keep working.
Now, let's say you put it on a terminal that DOESN'T constantly abrade, and has FAR LESS contact force - like a modern USB power adapter for a cigar socket. Will it work? Maybe - maybe not. But that's the original problem. Even with NO grease, he has intermittent contact. Why? Because the corrosion inside the socket doesn't conduct electricity, either. The only difference between it & dielectric grease is that dielectric is SLIGHTLY more fluid, so it's easier to scrape out of the way. It's not actually HELPING the adapter make contact, or improving the contact area. Neither is electrical grease, but it doesn't TRY TO STAY IN THE WAY to the degree that dielectric grease does. It's runnier, so it moves out of the way with far less force/pressure, while still providing all the benefits that you think you're getting from dielectric.
