I have breathed Life back into many Electro35's. Most likely I am to far and shipping costs would be high. If you have basic skills I could guide you through. Most likely the power wire above the battery box.
I think the best way is not to get a non-working GSN in the first place by paying the price and buying from a reputable seller. I feel kinda bad for shuttergal because every single time anybody got a faulty classic camera - her name comes up.
So yeah, don't buy one if they say vf is a "little" dusty or no batt but you can check that the shutter is working - it works at 1/500. Not a good deal even if it's a 100 dollars - speaking from experience.