I've been troubleshooting transmission problems on my 96 ex wagon with my dear friend and mechanic, we've changed fluid 3 times, just cleaned both selonoids. I was unable to start it immediately afterwards because it needed a jump. Went to jump it today battery was taking a charge but D4 started actually blinking and the car lost ALL power when I tried to turn it over. I let I charge a while longer door lights came back on were brighter then the same thing happened. Headlights turned on all nice and bright with key in I position. With key in II car lost all electric as soon as I turned the headlights on.
Plan on tinkering a bit tomorrow any thoughts as to where I should start? Besides fuses lol
Are the electric and transmission problems related possibly? At this point would cleaning the transmission filter help?
I have a replacement tranny in a parts car I'm trying my best to avoid that whole ordeal and most certainly don't want to go through that if the electric is screwed.

 

can you put in a verified good battery so you can eliminate if this has anything to do with it.

For now, get the code from the D4 transmission to see what it says.

Personally, I don't think these are connected unless the starter is shorted or grounding out in some odd way. But I would first verify with a good battery. Low voltage causes a lot of weird errors.