Overdrive shuts off during deceleration

[lightningfish]

1991 240sx auto

I'm back, very much humbled finding out I was just chasing a bad starter in my last post I'm now trying to fix what I apparently messed up in the process of checking my starter, alternator, ground and battery. When I let off the gas in overdrive the trans goes into a lower gear as if shutting off the overdrive then when I step on the pedal again it shifts back up(or turns back on). I know it's something that I screwed up while checking the above stuff just wondered if anybody knows of a good wire bunch to start with, I'm gonna start checking them all today.

[lightningfish]

Nevermind got the bum wire, the wiring diagrams are very cool