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Old 02-07-2022, 09:20 PM
JHZR2's Avatar
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Location: New Jersey
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W140 main power lead wiring diagram

I donít have 12v at all fuses. I pulled the fuse box and see the wires screwed well to terminals each designated with a letter. I donít know how the busbar in the fuse box are lined up and connected by row. Some rows didnít even have a main connector.

Can anyone point to a wiring diagram for the fuse box, and where the conductors, especially the one that goes to ďTĒ comes from? Hoping someone knows the connector name/number and location.

Thanks!





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Current Diesels:
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Old 02-11-2022, 11:09 AM
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Remember some fuses are after a switch - eg the parking lights and headlights. The fuse will only have power when the switch is on.

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000).

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Old 02-11-2022, 12:40 PM
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Quote:
Originally Posted by compu_85 View Post
Remember some fuses are after a switch - eg the parking lights and headlights. The fuse will only have power when the switch is on.

-J
Thanks. My issue was a window fuse that provides power to a combination relay that then provides the coil voltage to another relay to power large sections of the fuse box.

Convoluted!!

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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