

That's the one for my electric water pump, but I'm running the same one for all my underhood key-on hots was well. It shows the suppression diode in the diagram and I haven't had it ruin anything yet.

Actually, that isn't a diode. What is that symbol?
:edit: Here's how I have my underhood hots ran:

The blue wire that comes off the keyswitch now goes to blade "85", with "86" running to a ground. I have a fused(I hope) wire of unknown giant gauge coming from the battery hot into the "30" blade, and then the "87" blade continues on to where the factory splice is. You can see my giant crimp over there with the green wire from the relay running into it. This didn't completely cure my pulsing, but it is now so slight that I can barely notice it. I can notice the gauge wiggling slightly, but I can't tell the lights are flickering. I'd say a smaller relay designated for the voltage regulator sense wire would cure it completely.
Also, that crimp of blue wires I'm always talking about that powers all your underhood stuff is right where that giant copper one of mine is. If you cut your loom up in that area you should find it easily. This is on a '90 model truck, so the newer ones with the computer may be a bit different.