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...you are too kind. Amazing is quite a stretch. Hard of thinking would be more like it.
I'm still pondering that 25A fuse circuit, recalling how it once caused a buzzing main relay on an 83 or 84 LH. Fuse circuit passed just enough current to barely "pick" the relay when key was turned on, but couldn't support the load (as you noted) when the contacts close, causing the relay to pick-drop-pick-drop etc. and making a nice buzzing sound.
That was caused not by the fuse itself, but the corroded/broken wire fuse wire strands at battery + terminal. Now I'm wondering if something like that may be happening here — where there is enough currrent to satisfy the EZK's electronics and light the wimpy LED, but not enough to budge the bulkier Main relay—and thus no power to the LH ECU.
Not being much with electronics, I don't know if this theory holds any water, but I'd sleep better if Steve could tell us if he feels and hears that Main relay pull in with a solid click when he turns the key on. I'll respond to his latest post and direct him to this one, hoping to narrow things down a bit.
(Let us know Steve, OK?)
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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