I don't know how that worked but I'm bloody glad my mechanic discovered it when he whacked in a new alternator, otherwise it could have caused a fire. Electricity will always find a path.
He added another earth wire that went from the bracket that holds the hotpipe to the LHS strut tower nut.
 
I'd suggest first clean up some of the earth points in the engine bay (i.e disconnect and rub with sandpaper).
 
What broken temp sensor?
 

I found a broken temp sensor connector I may attempt to run the car without this plugged in and see if it's ok... (ibelieve it's a coolant temp sensor).
 
Drasic - already checked, the blade fuses are ok.... :)

sort out ur earth cables and youll be amazed of the result not to mention not having to worry about ur duece catching on fire. i had my alternator recoed, cleaned up my old earth cables and added another 4, replaced my broken coolant temp (to ecu) sensor and shes been running great eversince. hold on to ur microtech untill u've been in my car then decide whether u wanna sell it or not. if u really wanna sell it then ill take ur hand controller if u separate it  :)

that's awesome :) I'll have to get onto this when I get time.  At the moment I won't be using my car much casue I'm just too busy. Thanks for the offer of a ride.. I'll look forward to it! :)
 
What ECU are you running?
 
so big update with cars today - Supra is GONE! :D delivered it to the new happy owner today!  
 
also on Saturday I have a rally car experience :) looking forward to it!
 

edit - just realised it's a long weekend this weekend! durh. well I know where I'll be spending a bit of it! working on the car :)

Woo hoo! so it is! gotta love a day off work and get paid for it :D
now this weekend...
fix leaky valve in back wheel then 'scrub in' my new rear Fed RS-Rs in the hills :P
 

congrats on selling the supra! more money to sink into the mr2? hehe
im running the microtech lt10s and got rid of the airflow meter. a friend of mine also runs d same ecu on his duece with a modified /built engine.

Thanks - no I just bought a new pushbike, and the rest is going to a house fund! :) need to be kind of responsible in my old age lol.
 
Oh nice :) yay for getting rid of the AFM! :) 

that's one thing I'd definitely look at - fabricating a block off shroud for the air filter, and piping to it. Thinking about it- it *shouldn't* be that hard to do actually... could use AFM adaptors to mount a intake hose on the blockoff plates :)

this is what I think I need another one of:
 
coolant temp sensor (ECTS) I've damaged the clip and it's quite likely the wires are touching (It's unliekly this is contributing to my electrical problem tho)