94 Caravan 3.0L Automatic Code 15, No speedmeter

I have a 1994 Caravan, 3.0l V6 3 speed automatic A/C No Cruse control. and for a while during humid/rain days my Speedometer would cut out, causing the van too go into Limp-home-mode and the check engine light would also go on. Turning the car on/off waiting a while and the problem would fix its self, until recently were it has cut out and not come back. the computer gave me code 12 and 15 12 is the battery disconnected message, and code 15 says the speed sensor. So I went too the junk yard, and tried 2 different speed sensors hoping too fix the problem, but no luck, and no speed sensor. I have tried opening every plug under the hood i could get my hands on, spraying them with contract cleaner and putting dielectric grease and reseting the connections, still with no luck.

You changed both the input (turbine) and output speed sensors correct?

You changed both the input (turbine) and output speed sensors correct?
I don't think my Transmition has 2 Sensors, Just the one located on the Right side, Similar too a spark plug with 3 wires coming off of it, There is another connection located just above were you check the Trans fluid but It dont apear to be able too change that one...

I don't think my Transmition has 2 Sensors, Just the one located on the Right side, Similar too a spark plug with 3 wires coming off of it, There is another connection located just above were you check the Trans fluid but It dont apear to be able too change that one...

Okay, I just Did a little Check with my Volt Meeter...

On the Sensor there is a plug with 3 Wires, A white one, a purple one, and a Black one with red(Orange) Stripe. From my Battery, the white wire has no voltage, The Purple Wire is giving me 13.95v and the Black with a stripe is giving me 8.05v