Are there any tantalum capacitors on your model of megajolt?
Their failure mode is to short circuit, I had one fail on my megasquirt, and it burnt a trace on the pcb rather than blowing the fuse.
The small capacity tantalums look like a fat yellow grain of rice with a lead on each end, big ones like a yellow tictac with both leads on one side,
and are polarised so need replacing as removed, this may be marked on the silkscreen and will be marked on the outside with the voltage/temperature
ratings.
If you can find the bom for your megajolt, it will make identifying/testing them easier, the failed tantalums will have a very low resistance, and
should trigger a meter set on beep continuity test while in circuit.
Dave
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