Vehicle frequently unconnect blanks,speedo inop,windows inop,defrost defaults to high,all warning lights go on then off,loss of power, battery light goes on, then clears and runs fine for an indefinite varying length of time and starts all over. Replaced tipm, and ecm and still does it. 200000 km.

 

How about the battery condition?

 

Battery was checked and tested good at dealers.

 

Hold the dealers feet to the fire.