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Issue resolved.
Cause: faulty 4-pin computer connector that I put in, to give a way to unplug the Guino. Not the tiny ones for floppy drive, the larger ones that powered hard drives and plenty other stuff 'till the SATA drives came out.
I never could determine for certain if it was the male or female connector, or was it the pin/tube fit or the crimping of the wire to the connector contact. But I did determine the +12V wire passing thru the connector was intermittent.
Cure:
Severed the wires on either side of the connector. Inserted 8-10" of new wire in line. Twisted bared leads, soldered, then covered with heat shrink tubing and shrunk it. Seems to be fine now. I hope I didn't jinx it by saying so.
I got the cap and diode from Radio Shack but didn't bother putting them in. I think I'll return them. This fixit job was enough of a PITA as it was, without opening up the project box that holds the existing 8 Ohm resistor and redoing all that. It was worth it though.
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Check your tire pressure - keep it up !!
We've learned that diet has a closer relationship to cancer than we ever thought. Please see this Wikipedia article on The China Study.
Driving Lean Burn '97 Civic HX, lotsa mods by now! '89 Volvo 240 is semi-retired. I did love that car though!
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