Another Turn Signal Problem...Please Help!

I was in the process of wiring up a harness for my brand new trailer, when out of no where my right rear turn signal stopped working. I was testing what wires were hot with the blinker on when it appeared to short.
Here's what it's doing:
-It's acting like the bulb is out because the front Right and then indicator on the dash are both blinking fast.
-When I put the hazards on, they all work except the rear right.
-The break/reverse lights work fine.
Again, this started as I was fiddling around with an old, poorly installed trailer harness. So the signals was working fine until this.
Here's what I've done:
I tested the bulb.
I checked thet fuse (even though the other signals still work)
I tested the flasher
I checked the relays
I checked the turn signal/hazard switch
I did everything the Toyota manual says and more, and cant figure this out!
I am leaning towards a broken wire, that is about the only thing that would replicate the symptoms of a burnt bulb...I think. Any suggestions?
I doubt the ground is the problem just because the thing was working fine before and all the other lights but this one still work.

FreeBirn Red said:

Again, this started as I was fiddling around with an old, poorly installed trailer harness.

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I'm pretty certain you'll find the problem is the "old, poorly installed" harness. Dump it, make sure everything's fine after you do and start with a fresh harness. Old wiring, especially trailer wiring, can cause all sorts of electrical oddities.

It blinks more slowly when a bulb is out, more quickly when you add another bulb (trailer light), & very quickly when there's a direct short. So you gotta short!

If you have an ohmmeter, turn the lights off & check for continuity between the appropriate trailer harness socket & a frame ground. If you get 0 ohms, there's your short!. Start disconnecting things (like the trailer harness) until the problem goes away.

A good way to look at electrical diagnosis is a "binary search". Pick an arbitrary point in the problem circuit, hopefully where you can easily disconnect it, & see which half the problem's in. Then you "cut" that half in half and check both halves.

alright, so I checked the impededence at the bulb and got no short...not sure where to look from there. The only other place I have access to the lead (G-Y) is behind the spare where it goes to the left-hand light assembly. Any thoughts?

Problem Solved

Problem Solved! I found a connector inside the body (behind the left signal) that I was able to get the multimeter on. Power was making it there, but not past, so I replaced the wire from that point to the right turn signal connector, and it works. Thanks for the help.