[quote="rskdsk"]
Well ir seems half fixed. The dash no longer resets, but the wt temperature is still bouning a lot and the wt is flashing even at 100 ... not sure what up yet.
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Ok, at least things are getting better...
It seems to be safe to assume that there were two different problems.
Fortunately, the dash has absolutely nothing to do with the engine and ECU on these cars - the car will run fine without the dash and the dash will operate without an engine. That makes it an uncomplicated (though time-consuming) task to check wiring - no need to worry about the intricacies of the engine management computer.
Here is the pinout for the SPA dash. Looks like Pin 17 is the one you want. I'm not sure off the top of my head if that is a voltage or resistance sensor (I have the Microdash, which is a completely different kettle of fish
). As a first step, I'd suggest using a multimeter set to a 15V or higher scale to measure the voltage between pin 17 and chassis ground. You should see some sort of reasonable progression as the car warms up. Hopefully your dash will act up with the car standing still, or you'll need someone to watch the meter while you drive.
I expect you'll see some sort of out-of-range excursion on the meter at the point when the dash reports an odd temperature reading. If that's the case, it is almost certainly a problem in the car wiring or the actual water temperature sensor itself. There is a slight chance that a problem in the dash could cause odd multimeter readings, but it is unlikely.
If you don't see any odd readings on the multimeter, it could be that the meter doesn't react quickly enough (if it is an instantaneous short or open circuit, the meter may not react). You might need something like an oscilloscope.
If you were in my area I'd offer to help sort your car out in person. But you're on the other end of the east coast, I think.
TMI would be a lot closer to you than I am. They are the official support provider for all US Atoms, both the Brammo ones and the ones they built. Of course, there's no warranty on these cars and yours is quite a few years old anyway, so they'd most likely charge you to look at it and fix stuff. Of course, then you'd have the confidence of knowing your car got a thorough going-over at the factory. If that sounds like something you might want to do, I suggest you phone Mark at TMI and discuss the various issues with him.