Non starter after removing engine Options

[llamatronica]

Hi all, recently bought myself an st202 after having a zzt230 for a few years and not really liking it, bought it cheap as it required a new clutch and cambelt, ran fine on 100mile drive home, so pulled the engine and gearbox and completed the work required, put it all back together and it seems to have an strange fault that I've never seen before(been rebuilding engines for 20years), to begin with it just wouldn't start, then after checking all sensor and vacuum connectors it did start, and ran fine, so switched it off to finish the installation and when I tried starting it again I got this,
Key to on and the temp gauge goes to max and no engine light, won't start, turn key to off and engine light comes on temp gauge goes to min and fans start, turn key to on and same but when key is turned to off all lights and fan are off, tried shorting pins te1 and e1, but there's no engine light to read when ignition is in on position
everything is plugged in and connected as should be, tried bypassing circuit opening relay with no joy,

[Smaay]

sounds like you have a short somewhere in the wiring and after running it gets shorted. however you havent mentioned any any blown fuses so its not a power short, maybe a signal short.