1979 928 power mirror control

danmaitzen · 04-29-2005, 08:00 AM

I just installed a new Mirror Switch 4-Way 78-86 (911 613 115 00) in my stock 1979 928. Motor seems to work fine, except it only moves up and down on BOTH passenger and drivers side. So when I try to move the mirror out or in, it just moves up or down. Since the fault occurs on both sides I assumed that I messed up on the wire connections and the motors are fine.

Do you have any suggestions? I tried to change the wiring on the 4 way switch but in only caused the fuse to blow a few times.

Can someone post a wiring diagram or suggest what could be causing this. Essentially my 4-way switch only works 2 ways (up and down).

Thanks Dan

928ram · 04-29-2005, 01:57 PM

Dan, mine had a decal on the 4way itself with a wiring (color) code, it does sound as if you might have the wire on the switsh off a bit.

I know I've seen a diagram of the wiring for this on the web somewhere, but I don't remember where. Try starting at www.nichols.nu
and find the 928 tips at the bottom of the page. I'm pretty sure where I saw it was on someone's site where they were changing to that later GTS type mirrors, you'll likely have to do a little creative googling to find it.

danmaitzen · 04-29-2005, 08:21 PM

Thanks! Will start looking there!

Dan

928ram · 05-07-2005, 10:45 AM

Dan, did you find the wiring?

I found a mirror switch in my spare parts that's from an '85 (might be different), it has the small label on it with color codes; if you still need I'll try to scan it or hand drawn a scematic from it.

danmaitzen · 05-07-2005, 12:58 PM

No I did not find any wiring diagrams. I just kept guessing and blowing fueses.

I got it working (sort of), but once I go up or down that is all it will do. After the car sits for a while with the engine off it will go side to side again.

I am pretty close to giving it up! I would love a shot at your color codes. Here is a pic of the car.

Dan

928ram · 03:58 PM

Dan,

Here's the actual diagram from the service manual, with notes:

1) the upper "black" wire is actually black/violet, the red wires in pic are actually brown (brown is ground in all things 928), all others are the color they scanned at.
2) The devices shown: at top - 4-way switch
Center-left - side to side cange over switch
Bottom - both mirrors

{pic didn't post right...see below}

928ram · 05-07-2005, 03:57 PM

928ram · 05-07-2005, 04:24 PM

Dan,

Scanning the switch itself didn't go. I popped the mirror control out of mine (also a '79) and compared it to the switch I have loose ( both 911 613 115 00)

The best I can describe the wiring positions:

Change over switch: The side with one conductor gets a green wire (this loops to the 4-way also); the side with 2 conductors gets the single blue wire on one terminal and the single black on the other (these are L/R, if backwards swith the blue and black) Important: when I say "side" of the switch, it means the long side!

4-way switch * looking from bottom* , there are 2 terms on each side, one at each end of the rectangle. They go like this:

Top (front of car) - black w/violet stripe
Upper left - double white (2 wires)
Lower left - black and blue double (2 wires)
Upper right - brown
Lower right - green
Bottom (rear of car) - brown

Again; this is with the switch upside down, plug end facing you.

Let me know if this works or if my description really sucks, I'll try again

danmaitzen · 05-07-2005, 08:00 PM

Thanks, I am going to try it in the morning and let you know!

danmaitzen · 05-07-2005, 08:02 PM

I need to get one of those Service Manuals. I guess ebay would be a good place to check, never really checked! Are they all in color? Do you remember how much you got yours for?

Dan

928ram · 05-08-2005, 05:39 AM

The full manual set sells for over $300. I've heard that they are out of print now.
There are sources for the manuals on CDROM out there at a much more reasonable price (~$40), which I believe is compiled with some additional useful info.
Try this guy: jim928@ptd.net
I'm pretty sure that address is still current and I believe he has some other 928 lit that he's compiled to CDROM.

Sorry it took so long to get you an answer, didn't even realize I had the spare switch and for some reason I though I'd have to pull the whole door panel to look at mine.

928ram · 05-08-2005, 05:43 AM

The manuals aren't in color except for the '78 wiring charts, which works for us '79 owners because the wiring is the same.

The car looks very nice. original paint?

danmaitzen · 05-09-2005, 10:44 AM

I had the car repainted in the original silver with a clear coat. The old paint was not bad, but I could not get it to shine anymore.

BTW, do you know what the miles per gallon on average are on your car. Do you know what it is supposed to be? Mine seems to be really bad around town.

I will start looking for a service manual!

Thanks Dan

928ram · 05-09-2005, 10:59 AM

Car looks good, I'm going to have to repaint in the future and have been considering changing the color; that silver is a really good color for these cars.

Last I checked MPG I was getting in the 14-15 range combined driving, which I considered quite good how I drive sometimes. I know some of the guys with the later, EFI cars get that or slightly higher but I'll gladly trade a MPG or 2 to never have an FI brain go bad. ($$)

I know the MPG with the CIS can get bad fast if the mixture gets to the rich side, look for sooting on your plugs and have it adjusted if needed.