It's NOT my car

One of wires read 5v or so, one 12v+, other 2 read 0.
Could this be a problem, the 5v one?

It's a G plate with TU3 engine I think he said.
Plastic case of coil bubbled for a second where metal got so hot, did run after this once cooled down, not for long.

I call it coil, it's this style as opposed to cylinder old type:
http://www.the-ecu-doctor.co.uk/Rena...0Amplifier.jpg