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Re: The oil pressure dash light never illuminates now. nm Posted by Larry West [Email]  (#1140)  [Profile/Gallery]
(more from Larry West) on Wed, 2 Mar 2011 08:02:39
In Reply to: The oil pressure dash light never illuminates now. nm, BAAB  [Profile/Gallery]
, Mon, 28 Feb 2011 22:27:54
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Now that we've established that, it's back to the original suggestions.
The OP light circuit is about as simple as they get. The battery supplies 12 volts, through a fuse, to the instrument cluster. One of the traces on the back of the cluster brings 12 volts to the OP bulb. The other trace goes out of the cluster, and down a wire to the OP sensor on the oil filter adapter. The sensor grounds the wire when there is no oil pressure, completing the circuit through the engine block's ground to the chassis, and the light lights. That's all there is to it.
Very little to go wrong here. Bad bulb is a possibility, bad sensor even, maybe a bad fuse (though if other parts of the cluster are working...).
But I'd start with the original suggestion, and look for a wire that should be connected to the OP sensor on the oil filter adapter that isn't. Then try a different bulb (swap one of the others like it, just not the alternator bulb), then try grounding the end of the wire at the sensor to the block. If the light lights then, then the sensor has gone bad.
_______________________________________ Current: 2002 9-5 Aero Kombi Cosmic Blue 2000 9-5 SE sedan, Imola Red 1990 900S Rose Quartz, Auto Past: 1999 9-5 LPT Combi 1999 9-5 LPT sedan 2002 9-5 Arc 1990 900 5-speed 1986 900 turbo Convertible 1991 9000 turbo 1980 99 GLi 1986 900 turbo 1986 900 S 1991 900 turbo 1984 900 turbo 1976 99 GL
, Mon, 28 Feb 2011 11:55:34, Mon, 28 Feb 2011 15:51:28
, Mon, 28 Feb 2011 12:55:58, Mon, 28 Feb 2011 21:30:09, Mon, 28 Feb 2011 22:16:01, Mon, 28 Feb 2011 22:27:54, Wed, 2 Mar 2011 08:02:39 <-- Viewing This Message, Tue, 1 Mar 2011 08:42:30
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