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You may have a burned up fuse block. Wouldn't be the first time this has happened to a 740. There's a lot of heat around the fuel relay, the OD relay, and the headlight relays. This can melt the plastic, and allow wires to move into contact with each other.
Assuming you're blowing a 25A fuse or similar, and it's an instant POP when it goes, that would be a dead short, I'd say.
Here's what I'd do. Pull the coin tray/cig lighter thing out, which I assume you already did, and put the shifter into first, but make sure the car can't roll! Unclip the fuse box on each side (big plastic tab) and pull all the fuses, relays, and wiring up and into the car so you can get at the back side. You'll need to remove at least the OD relay to do this. It's too tall.
You may find burnt wires touching under there, or a whole burnt fuse or relay socket. Look for the telltale signs of electrical overload- brown plastic, discolored wires, missing insulation, deformed socket contacts.
Patch it up if you can, use electrical tape (Scotch 33 preferred!) to separate damaged wires, or make plans to replace the thing with a good used one.
Good luck with it!
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Rob Bareiss, New London CT ::: Roterande Fläkt Och Drivremmar!
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