Jumper ed it on to the earth braid. A little spark came out and went to the diagnostics menu.
Still nothing on neon
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You jumpered the 12V and nothing on the neon? But it works with an external DC supply?
That doesn't make sense.. you need to jumper the -ve side of the 12V.. if the neon doesn't light up then you possibly have a faulty transformer. But a small spark when you ran to ground says you have a voltage supply so to find the value of this run a DMM to the same wire and other side of DMM to earth braid.. see if you have 12V
