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David, thanks for your comments. My idea was based on '93 diagrams, which I've found in many cases to apply to late '80s LH 2.4 models. And I believe that when I first posted this, I got a favorable response—saying it worked—a memory (perhaps faulty) which encouraged me to offer it this time. I'll try searching for that response. EDIT: see** below...
I based my fuse orientations not on the actual FI diagram page, but on the fuse schematic pictorial at the front of the WD book. This looks like an overhead view of the fuse panel, which I took to be a realistic view—although the directional current path does differ from how Fuses 1 and 11 are shown on the FI diagram page.
On the "Electrical distribution, fuses" pictorial, the Battery input to Fuse 1 comes in from the bottom (output at the top). But you're right about needing "functionality" (other than jumpering to fuse 11). I overlooked the fact that Fuse 1 has multiple outputs, the others leading thru C2 to EZK pin 5, and C3 to LH ECU pin 4.
As I said, I thought I'd recieved positive feedback when I first posted this (as theoretical but untried, I hope). But fuse orientation aside, my overlooking the need for the other fuse 1 functions says it won't do what I thought.
As for fuse 11, I blew it there too, relying on my 240 mindset where jumpering +12v to the tank fuse "input" is electrically the same as FI relay 87/2 and powers both pumps, but only when the fuse is in place. Of course, the 700/900 blade fuses don't allow that kind of jumpering.
Alternative possibilities(?) below:
1) Get battery +12v from another (removed) fuse input, such as #5 which powers only miscellaneous lights, radio, etc. (on '93 diagram), leaving #1 for the important stuff.
2) Make up a pluggable Blade Fuse holder extension, with a pigtail to recieve the jumpered voltage, and substitute it for fuse 11 (and maybe other applicatinons?). As with the 240, it could force either pump, or both—depending whether the extended fuse was in place or and, and how the pigtail input was oriented.
I know that this jumpering only substitutes for FI relay 87/2, but my 240 experience (with 2 exceptions-both in family LH 2.2 '87s) is that the "System" relay half (87/1) seldom fails. Our fix for those exceptions was a 3-way jumper like you describe—from 30 to both output harness sockets. The tip-off was not hearing the LH 2.2 relay "click" at Key On. Not hearing the LH 2.4 pumps at Key On could be due to either half of the FI relay, I believe.
Another time I'll brag about my 940 FI relay's home in the glove box.
** I found my "favorable" response here, but now see it was just for a pump test, not a no-start. I see I bragged about my FI relay in that thread too.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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