From: Pirtle, John [John.Pirtle@ceridian.com] Sent: Wednesday, February 07, 2001 10:11 PM To: 928 Subject: [928] more than you want to know about fog lights I removed my fog lights tonight and figured out what's what on my '87. #1 - my factory wiring is not the same as p.97-259. The workshop manuals show a WS/GN wire (white/green) going to the fog lamp (I have a blue wire), and a WS/GE (white/yellow) going to the auxiliary high beam (I have a yellow/green). Anyway it's not hard to figure out. The fog lamps are the *inside* lamps. The aux high beams are the *outside* lamps. (You can see this in the Owners Manual pictures.) They all use the same bulb, with the fogs having a reflector umbrella to cast the light downward. If your lights work opposite (fogs on outside, etc) then your connections may have been switched, which could be an honest mistake (although if you want to sorta-use the fogs for pseudo-headlights you could make this switch and I think it would work fine, but don't blame me). My PO had replaced my right (pass side) fog assembly, using a left light flipped upside down. This works except that the fog umbrella is upside down. The fog rear reflector can be removed and flipped around. Remove the screw in the rear, and unscrew the vertical adjustment completely. The entire rear reflector can then be pulled out, and the adjustment mounts twisted and removed (you'll see). Place them on the opposite end and put the reflector back in, and the umbrella will then be on top. Nicely engineered really (except for the easily-broken plastic adjusters!). So anyway, the left and right assemblies seem to be interchangeable. Now, the operation is this - -Light switch set to parking lights, and fog switch in: inside fogs on. -Light switch set to parking lights, and fog switch in, and turn signal stalk pulled to you: all 4 lights on - fogs and aux high beams (this lets you flash-to-pass). -Light switch set to parking lights, and fog switch in, and turn signal stalk pushed forward: nothing - inside fogs stay on, aux high beams stay off. -Light switch set to head lights, and fog switch in: head lights and inside fogs on. -Light switch set to head lights, fog switch in, and turn signal stalk pulled to you: head lights go to bright, inside fog lights on, outside aux high beams on (this is flash-to-pass with all lights to get someone's attention). -Light switch set to head lights, fog switch in, and turn signal stalk pushed forward: head lights go to bright, inside fog lights go *off*, outside aux high beams on. So other than the flash-to-pass, you don't run with ALL lights on together. Now, some PO had inserted a wire between the 12V connections of my fog and aux high beam bulbs (on each side). This caused all 4 bulbs to light when the fog switch was pushed in. This worked fine until the high beams were turned on. Then all the bulbs in the fog assemblies dimmed and sorta flickered. It may be due to the gauge of the wire the PO used - it was not very thick. However the system is designed for separate 12V leads to the fogs and the aux high beams, so something may not be very correct with this wiring mod. I would recommend doing something back at the fuse panel or the switch to get all 4 lights on at the same time (this would be nice for that rainy day or late afternoon twilight when you don't really need headlights but need other cars to see you - maybe one of our electrical experts will take this as a project...). On the other hand, the electrical system may not be up to so many lights on bright....? So there's my evening adventure. :) John Pirtle 87 auto (lights back to normal) http://members.rennlist.com/pirtle http://www.928oc.org From: Andy McIntyre [andy@seaside.co.nz] Sent: Thursday, February 08, 2001 6:35 PM To: John Pirtle; 928 Subject: [928] Re: more than you want to know about fog lights At 10:52 8/02/01 -0500, Pirtle, John wrote: >The pattern is different, but when you interchange the lights you *flip*, so >the pattern ends up in the proper location. The fogs have more of a >dispersion pattern with the umbrella reflecting down. The aux high beams >are more directed. I found out the hard way that the US specification S4 fog/auxiliary lamp cluster is different to the UK specification unit - the fog and auxiliary high beam lens positions are transposed, and the UK item includes the parking lamp behind one of the lenses. The UK specification fog lamp lens has a horizontal line about 1/4 of the way up (from memory the US one does, too), and focuses the beam at a steep downward angle. Swapping the lens to the other side, and flipping it places this horizontal line at the top of the lens, and upsets the beam focus. Andy McIntyre 1988 SE (sic) Black/Schwarz/A1