Last chance to help save 200 rivets!

[exwestracer]

I'd asked in my "rebuild" thread about a "hot in run" lead that runs over the top of the (stock Ford) fuel tank. I haven't been able to find it on any wiring diagrams, and I can't see any reason for it. I also can't see where it goes....

I'm hoping somebody else who has built one of these cars might be familiar with what that lead is for. It goes directly to a fuse under the dash, and it is hot anytime the ignition is "on".

If I can't figure this out tonight, I'm going to remove the fuel tank cover panel...which I really DON'T look forward to.

[David Hodgkins]

Fuel level sender?

:)

[skullandbones]

It's got to be the fuel level sensor like David said or the fuel pump. There aren't any other circuits that are supposed to be in that area except lights. But you did say someone was had done some rather creative wiring!!! WEK.

[rj35pj]

What about the inertia/rollover button. My button is located under the dash near where the frame serial number is and runs to the electric fuel pump near the tank. Has that button been removed and replaced by a fuse.

[Gordon Levy]

If it's a donor harness and know what year I have an EVTM manual that I can fax a wiring diagram to you.

[exwestracer]

I know for sure it is NOT the power feed for the fuel pump, or the trigger wire for the pump relay. I have a 90 Mustang harness diagram, and it shows only a ground side wire for the sender (which is typical). The American Auto Wire harness that the mess is based around shows exactly the same thing.

[michael everson]

What color is the wire? I bet someone ran it back there for a future power source. Why not just pull the fuse and leave the wire?
Mike

[exwestracer]

What color is the wire? I bet someone ran it back there for a future power source. Why not just pull the fuse and leave the wire?
Mike

Mike,
The wire is pink with a gray trace. It's not in the Mustang or Auto Wire diagrams....

That's the general idea, I've eliminated a half dozen fuses and a couple of relays already. I'm just wracking my brain to figure out if it's something I CAN'T eliminate.

[michael everson]

Is it coming out of a ford fuse box or a painless type fuse box?
Mike

[riptide motorsport]

It might be a ron francis harness from FFR, check his diagram. I believe the roadster has the same basic wiring harness from Ron FRancis/FFR. Ask in the roadster forum also.

[exwestracer]

It was wired into the generic Buss fuse panel that I did away with (see arrow in pic).
21083
It's NOT part of the American Auto Wire fuse box and harness. They don't use any tracer stripes on their wires.

Anyway, the rivets get to live another day at least. Just spent 4 hrs digging and breaking concrete to find out where the water was coming into my basement. STUPID RAIN.

[exwestracer]

Well, I know it's been awhile; but if anyone's interested the mystery has been solved. A friend came over with one of those lighted borescopes, and we found that whatever type of fuel level sender that was installed in the fuel cell takes a 12V+ lead. There are terminals labeled GND and POS (fitting...) on top of the sender unit, and that's where the mystery wire ends up.

Not too familiar with that type of sender, but somehow the possibility of a short causing a spark INSIDE the cell doesn't seem too keen. Oh well, that ISN'T coming out; so I hope it ends up being safe.

[MVRight]

Could be a capacitance sender like this from Speedhut

http://www.speedhut.com/ecommerce/product/681/Fuel-Level-Capacitance-Universal-Sender

[exwestracer]

Could be a capacitance sender like this from Speedhut

http://www.speedhut.com/ecommerce/product/681/Fuel-Level-Capacitance-Universal-Sender

That does look like the same writing and the same type of connections. Thanks!