I failed to remember the Auto electricians mantra "Always start with the battery"
The neutral lead had worked loose, so when I moved the leads near the heat sink I could hear the arcing on the neutral terminal. ( why do we always fear the worst?)
When did I find the problem- only after removing the tank and heat sink!!!!
I did clean up any and all contact connections that I could see just to try to kid myself I hadn't wasted a sunny day!
But to save yourself wasting time please remember. "
Always Start with the Batery
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