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Old 04-04-2010, 02:35 AM
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layback40 layback40 is offline
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Join Date: Nov 2009
Location: Victoria Australia - down under!!
Posts: 4,023
There are only 2 ways that the light would stay on with the ignition off

1/ power is connected to the thin wire at the back of the alt via the reg.
2/ there is power still connected to the down stream side of the ignition switch.

Disconnect the thin wire at the back of the alt reg. Put a volt meter on the wire, if 0volts then most likely reg problem. Put volt meter on tab on reg. If a few volts (dont need 12) then reg is faulty. If 0 then the problem is some place else, maybe the loom.
If when you test the wire you get voltage, then ig switch is bad or loom fault.
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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
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