I blew the fuse with a momentary short (while "optimizing" my multi-way fridge with an external DC On/Off/On switch. Oops. Was careful with my hands, but not ALL of the loose contacts.) The title says nearly everything I know, except for one additional "mystery" - the hot side of that branch circuit shows a tiny bit of voltage - roughly 0.26 VDC. I don't know what to make of the non-zero value. The new fuse looks perfect, and I'll test it for continuity tomorrow AM.
I've also pulled AC power, and the Battery cable to let everything "quiet down" before plugging AC back in. But LED4 turns back on, and the same tiny voltage reading. re-appears. (All other DC branch circuits have full voltage.) I thought that the WFCO LED tested for continuity across the fuse - and with a good fuse, it should go out. Incidentally, I have some slightly sloppy wiring which treats a couple of ground wires as "common" DC grounds. I'll SWAG that doesn't perform any "GFCI-like" testing for leakage on it's individual secondary DC circuits. Am I wrong?
So, I suspect that I've blown something in that branch circuit of the WFCO fuse board, and the 0.26 Volts is some sort of downstream "leakage" from the LED or blown WFCO components.
I could try a couple of tests:
(1) Pull the Fuse Board (everything cold, this time!) and re-wire to one of the empty, unlit LED fuse slot near the bottom. See if it works with current 20A fuse.
(1b) Rewire as in #1, but (if it comes up), subsequently replace the 20A fuse with the smallest fuse I've got in that form factor (probably 5A), and see if it blows in a no-load configuration of accessories. If 5A doesn't blow, then I might be able to test for amps in-line - but not sure if I should bother,because a "short circuit" which can only accept something less than 5A would not be taking the voltage differential on "open" wires all the way down to 0.26 VDC.
anything else?
WFCO "mystery" - branch LED4 stays on, even though fuse replaced.
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