John, I won't argue with you about D&M machines being good or not as I have very limited experience with them! I would expect them to have a higher survival rate than other machines like Montgomery Ward or GM Frigidaire "Super Surge" dishwashers, Borg-Warner Norge/Wards clothes washers or Frigidaire 1-18 dryers (BTW I have no experience with the B-W washers, I'm just speculating from what I have read on them here and all my Super Surge Dishwashers and my 1-18 dryer still work!).
I know that some people just don't use their portable dishwashers as it's easier to hand wash dishes than clothes or bed sheets! And that's exactly what happened with my 1965 D&M-made Frigidaire top-loading impeller dishwasher. It's original owners are good friend of mine and they almost never used it. One of the reasons was the unsuccessful use of hand washing detergent which resulted in a big mess! The other reasons were water which left mineral stains on dishes and the trouble to roll it from it's resting spot in the carpeted living/dining room to the kitchen and hook it up to the sink and to hear it running during the wash and drying time as the kitchen, dining and living rooms are in the same open space in the house it was in...
But even if it was very lightly used and stored in an unheated room for about 20 years, it didn't suffer from deteriorated rubber, wiring or hoses which are all original. The porcelain inside had some iron stains but it cleaned nicely and still shines. In fact, it looks better than my newer Plastisol-coated Frigidaire dishwashers!
Brian,
How this white wire got inside the tub? From your picture, I doubt it's from the wiring harness but at this point, you might want to remove the front panel to see if there's anything wrong there! Do you know anyone who hates your dishwasher who might have tried to shorten it's usable life by sabotaging it?!!
I hope you'll post what else you find! You should have a closer look at the pump too! it could be seized but it could also be blocked by something as Scott suggested!