HELP, My 85 300 SD only has a power drain (20+ Amps) when you pull the key out of the ignition and the steering lock sets. Anyone know why? What to check? Replace ? If the key is left in there is no power draw. Thanks to all in advance

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87 300SDL 220K
85 300SD 218K
82 diesel Chevette 440K
85 subaru 4WD turbo
83 4.1L buick powered cutlass THE TOY

One thought, even though not armed until the car is locked is to disable the factory alarm system. Do do this, remove the carpeting in the passenger footwell and you'll see the plug underneath there. Try that and see if the draw stops.

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Regards,
Aaron

I tried that as my first thing. One more detail what ever it is, is on fuse number 13. Thanks again

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87 300SDL 220K
85 300SD 218K
82 diesel Chevette 440K
85 subaru 4WD turbo
83 4.1L buick powered cutlass THE TOY

I would pull 1 fuse at a time and see if the draw quits. Un-hook the (-) battery cable and hook an amp guage between the negative battery post and the neg battery cable. Does your '85 have the vacuum assist pump in the trunk for the door locks? I have seen them stay on and draw the battery down.
Also, un hook the Alternator if you can't find the problem thru the fuses. A diode can be shot and cause the Alt to bleed power. Make sure you un hook all of the wires to the Alternator. Chris

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.

All of the above list in various post. It is on fuse 13 with radio, antitheft both disconnected, and only with key pulled out.

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87 300SDL 220K
85 300SD 218K
82 diesel Chevette 440K
85 subaru 4WD turbo
83 4.1L buick powered cutlass THE TOY

I'd pull the electrical part of the key switch out and take a look back there for loose connection, broken plastic pin separator, metal chip, etc.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)