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Re: bulkhead connector pinouts Posted by Larry West [Email]  (#1140)  [Profile/Gallery]
(more from Larry West) on Tue, 20 Jul 2010 12:31:42
In Reply to: Re: bulkhead connector pinouts, turbocon86, Tue, 20 Jul 2010 08:30:38 Members do not see ads below this line. - Help Keep This Site Online - Signup |
+30, +X, +15, +54 and +S are all power busses in the car. A wire that just goes off to +Something connects to that bus someplace. It is simply a shorthand so they don't have to duplicate everything. There is a diagram for the +X bus (and the rest...) in the Bentley or Shop manuals.
+30 is the battery power. Only disconnecting the battery shuts it off.
+X is for your accessories: radio, etc. This bus is powered with the ignition switch in all positions except off.
+15 is the switched, car on, car running bus. This powers the fuel & ignition systems, and any other devices that should only be on when the car is running. It is only powered when the ignition switch is in the start and run positions.
+54 is switched power that is only powered when the ignition switch is in the RUN position
+50 is the start bus, and is only powered when the ignition switch is in the START position
+S is the key in ignition warning circuit, and is always powered.
If you are seeing "+X" on the supply (top) side of the fuse diagram, that is already inside the fuse box, and probably is going to one of the large relays. Inside the fuse box, many fuses are supplied by one relay for the +X bus. On the load side of the fuse (bottom), follow the wire to the 152X/H29-2 (29 pin connectors through 1990) or the H33 (33 pin connectors 1991-).
The +X, as I recall, is supplied by one of the relays in the fuse box. The ignition switch only provides energizing power to that relay. The relay connects the battery to the fuses supplied by the +X power.
_______________________________________ 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
, Tue, 20 Jul 2010 04:18:56, Tue, 20 Jul 2010 12:31:42 <-- Viewing This Message
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